Lorentz-Poincare relativity and a scalar theory of gravitation
Special relativity may be derived from Lorentz contraction. It follows that the relativity principle could be broken in the presence of gravitation. This seems to work. Special relativity may be derived from Lorentz contraction. It follows that the relativity principle could be broken in the presence of gravitation. This seems to work.
Arminjon, Mayeul Arminjon, Mayeul
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For many years I never questioned the obvious fact that masses attracted each other (inversely as the square of their separation – to complete the mantra). The attraction was so blatant that it required no thought. But then observations of galaxies and quasars forced me to accept the fact that extragalactic redshifts were primarily intrinsic and not the result of recessional velocity in an expanding universe.
Arp, Halton C.

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Process and Installation for Generating a Gravitational Field
Includes a patent application for such a device, with diagrams.
Bettels, Peter
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Gravity as Expansion and Many Worlds
Each point on the Earth’s surface is accelerating upward at a rate of 9.8 m/sec2 in terms of the local freefalling system of inertialcoordinates. When people first learn this fact, they sometimes entertain (for a moment) the idea of the Earth as an expanding sphere, with a radius increasing at a constantly accelerating rate… However, physical theories that can claim to make sense only in the context of some presently undefined theory of consciousness are inherently dubious.
Brown, Kevin
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The Living Universe.

In the Living Universe, the properties of matter slowly evolve with a transformation in the mass and size of the electron. Matter was created not out of the chaos of an explosion of space and time but rather from the perfect and orderly reproductive processes of ordinary matter in the form of electrons and protons. This book is available for sale.
Carter James
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How gravity works, a unified field theory
In 2011 he published FUTURESCIENCE—forbidden science of the 21st–century, which explains how Gravity works and much more: The nature of Dark Matter; the reason why spiral galaxies are spiral shaped; how gravity waves can be generated and used to provide unlimited supplies of free energy. It also describes how Electricity works at atomic level and why a magnetic field is produced when a current flows; and the cause of permanent magnetism.
Cotterell, Maurice
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Turning gravity inside out
For the past hundred years, gravity has proven to be a considerable monkey wrench in quantum math. Through this project, I propose that a surprisingly simple principle of accelerating particle expansion underlies the four known forces, offering a potential reconciliation of the laws of physics.
deWilde, Cruz
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Relativity The Special and General Theory
Einstein, Albert
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Gravity
Gamow, George
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The Gravnetic Field
The existence of a vector field is shown, originated by all moving masses which exerts a force on all other nearby moving masses.
Guillermo, Luis
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Antigravity.org
Sergey Ivanenko explains gravity as an inertial phenomenon caused by movement of the universe with respect to higher dimensions.
Ivanenko, Sergey
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Spacetime Model
The “Spacetime Model” is an alternative theory based on spacetime. Instead of limiting it to general relativity, the author has extended spacetime to all elements of the universe: particles, mass, charge, quarks, antimatter, Standard Model, forces…
Jerome, Jacky
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The Origin of Gravity
The cover is the world of everyday existence, a planet held together by internal forces resisting disassociation from the unceasing influence of spatial expansion. A weak acceleration indeed by classical standards, yet the instrument of gravitation, the signature of every mass, wherever situated, however structured. Herein, spatial expansion is identified as Einstein’s cosmological constant Λ, yea no longer an ad hoc after-thought charged with the task of saving the universe from gravitational collapse, … herein now promoted to the lofty position of creator. There is no inertial force without acceleration; no gravity without expansion. What then is the universal communicator, that which underwrites the laws of physics. In the words of Richard Feynman: “…it is the space, the framework into which the physics is put.”
Jimerson, Bruce Darrel
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An exceptionally elegant “Theory of Everything”
Starting out at the basic postulate and working out textbook equations involving the “Laplacian”, we predict the electric field to be a longitudinal sound-like compression wave, 99% analogous to the soundwaves we observe in the waters and air all around us. Gravity is then predicted to be *standing* longitudinal sound-like compression waves, which would be 99% analogous to standing or resonating sound waves, such as in musical instruments and which can be made visible with “cymatics”.  In other words: our simple theory predicts gravity to be 99% analogous to “acoustic levitation” as can be shown in the laboratory.

The major difference between our aether model and “real” fluids or gases, besides the parameters like density etc., is that the aether is modelled to be loss-less and non-viscous.
Lammertink, Arend

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Variable Mass Theories of Gravity
Several attempts to construct theories of gravity with variable mass are considered. The theoretical impacts of allowing the rest mass to vary with respect to time or to an appropriate curve parameter are examined in the framework of Newtonian and Einsteinian gravity theories. In further steps, scalar-tensor theories are examined with respect to their relation to the variation of the mass and in an ultimate step, an additional coordinate is introduced and its possible relation to the mass is examined, yielding a five dimensional space-time-matter theory.
Leclerck, M
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Is Gravity Caused by Tension in the Fabric of Space-Time
A brief article by Robert J. Lee arguing this theory.
Lee, Robert J.

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The Yin-Yang Universe
The ideas presented in this book challenge present views of the Universe from the ground up, including the second law of thermodynamics and every universal constant there may be.
Letourneau, Marc
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Space Itself Is Expanding: Gravity and General Relativity Explained
It turns out earth’s Gravity is a “fictitious” force — not a pull downward, but a push upward by the locally ascending, expanding surface of the earth.
Levitt, David
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Relativity and the Cosmos
In this essay, Alan Lightman explores the history and meaning of general relativity.

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Mind-boggling Gravitation. Applying the Lorentz transformation of Mass-Energy.
The Mean Root Velocity of the planets in our solar system equals 12278 m/s.  Inserting this velocity in the Lorentz-transformation of Mass Energy we find the Gravitational Constant of Newton.  This is explained in detail in this book that you can download for free. You will find in this book also many equations and calculations supported by linked Excel sheets. Also: free downloads. For more information: see the provided link.
Loeffen, Ruud
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The final theory.
Rethinking our scientific legacy. All matter is expanding.
McCutcheon, Mark
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Gravity The Proces of Acceleration
Gravity is the acceleration process caused by the distortion of relative time space bestowed upon by matter. Predominantly, such relative time space distortion is acquired within the volume of matter; within rotating and orbiting masses; and within the acceleration process of any mass, such as a car starting to run or a rocket lifting itself off the ground. However, such relative time space distortion also exists in the universe itself giving it a process of acceleration as well.
Miensinompe, Samuel V.
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Overview of Hypersphere World Universe Model
This paper provides an overview of the Hypersphere World-Universe Model (WUM). WUM unifies and simplifies existing cosmological models and results into a single coherent picture, and proceeds to discuss the origin, evolution, structure, ultimate fate, and primary parameters of the World. WUM explains the experimental data accumulated in the field of Cosmology and Astroparticle Physics over the last decades: the age of the world and critical energy density; the gravitational parameter and Hubble’s parameter; temperatures of the cosmic microwave background radiation and the peak of the far-infrared background radiation; gamma-ray background and cosmic neutrino background; macrostructure of the world and macroobjects structure. Additionally, the model makes predictions pertaining to masses of dark matter particles, photons, and neutrinos, proposes new types of particle interactions (Super Weak and Extremely Weak), and shows inter-connectivity of primary cosmological parameters of the world and the rise of the solar luminosity during the last 4.6 Byr. The model proposes to introduce a new fundamental parameter Q in the CODATA internationally recommended values
Netchitailo, Vladimir S.
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Universal law of gravitation
Newton, Isaac
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Quantum Cosmology With Decreasing Gravity
16th part: A consequence of my ‘Holistic Quantum Cosmology with Decreasing Gravity’ (see this) is an accelerating Universe, caused by a non lineary decrease of the gravitational forces in the Universe.
Nielsen, Louis
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This article was written with considerable input from several senior members of the PF community.The Balloon Analogy is … disliked (often intensely disliked) by serious physicists because it causes at least as much confusion as it is intended to avoid and is often badly misunderstood and/or incorrectly extrapolated to ridiculous points of view and this article is intended to help with that problem.
Phinds on Physicsforums Insights
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Galactic Gravitation Calculator
Demonstrates how new quantum gravity theory explains orbits in spiral galaxies without Dark Matter.
Seiler, Roger W.
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The Relativistic Space-Time Perspective
This paper formulates additional relativistic equations examining Einstein’s deductions from a Relativistically Distorted Perspective.   For an observer moving at a Relativistic Speed, some aspects of everything outside that traveler’s immediate environment would appear sped up.  That would include the traveler’s movement through space: meaning an apparently higher Relativistic velocity.
Taylor, David

Tesla published a prepared statement on his 81st birthday (July 10, 1937) critiquing Albert Einstein’s theory of relativity. See also this video.

Commercial Antigravity research and products. Site contains videos, graphics, plans and schematics.
Ventura, Tim
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Emergent Gravity and the Dark Universe
Starting from first principles and general assumptions Newton’s law of gravitation is shown to arise naturally and unavoidably in a theory in which space is emergent through a holographic scenario. Gravity is explained as an entropic force caused by changes in the information associated with the positions of material bodies. A relativistic generalization of the presented arguments directly
leads to the Einstein equations. When space is emergent even Newton’s law of inertia needs to be explained. The equivalence principle leads us to conclude that it is actually this law of inertia whose origin is entropic.
Verlinde, Erik

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Many other theories
about Space, time and gravity you will find on Amazon.com.
A Worldwide list of 8000 (!) dissident scientist you can find HERE.
Are you an author about Gravitation and want to be listed here: please send your information to rmmloeffen@gmail.com
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What to take seriously?
This is an interesting website about the question: How to decide on what to take seriously
Well, this webpage with the overview wants to take everybody seriously and aims to stimulate people to compare, learn, innovate and work together!
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How to become a
GOOD Theoretical Physicist
This is a web site constructed (and still under construction) by Gerard ‘t Hooft for young students – and anyone else – who are thrilled by the challenges posed by real science, and who are determined to use their brains to discover new things about the physical world that we are living in. In short, it is for all those who decided to study theoretical physics, in their own time.
Gerard ‘t Hooft
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Map of theories of everytning
This map of the frontier of fundamental physics, built by the interactive developer Emily Fuhrman, weights questions roughly according to their importance in advancing the field. It seemed natural to give greatest weight to the quest for a theory of quantum gravity, which would encompass general relativity and quantum mechanics in a single framework.
Fuhrman Emily