Free software

1. Lumberyard (Game engine) open-source and free tool

Amazon Lumberyard is a free cross-platform triple-A game engine developed by Amazon and based on the architecture of Cry Engine, which was licensed from Crytek in 2015.

2. Sculptris (sculpture tool) open-source and free tool

Sculptris is a virtual sculpting software program, with a primary focus on the concept of modeling clay. It entered active development in early December 2009, and the most recent release was in 2011.

3. Make human (game model creator) open-source and free tool

Make human is an open-source 3D computer graphics software middleware designed for the prototyping of photorealistic humanoids. It is developed by a community of programmers, artists, and academics interested in 3D modeling of characters.

4. Ipi soft (motion capture software) not free tool

iPi Motion Capture is a scalable markerless motion capture software tool that supports 1 or 2 Kinect cameras or 3 to 6 Sony PlayStation Eye cameras to track a human action and convert it into a motion capture file

 5. Blender (Complete tool) for modeling, texturing and so on (open-source and free tool)

 Blender is a professional, free and open-source 3D computer graphics software toolset used for creating animated films, visual effects, art, 3D printed models, interactive 3D applications and video games.

6. Audacity (music editor) open-source and free tool

Audacity is a free open source digital audio editor and recording computer software application, available for Windows, OS X, Linux and other operating systems.

7. Awesome bump (bump map editor) open-source and free tool (optional)

Awesome Bump is a free program written using Qt library designed to generate normal, height, specular or ambient occlusion textures from a single image.

8. Faceware (facial animation) not free tool

Faceware Technologies is an American company that designs facial animation and motion capture technology. The company was established under Image Metrics and became its own company at the beginning of 2012.

9. GIMP (image editing) open-source and free tool

GIMP is a free and open-source raster graphics editor used for image retouching and editing, free-form drawing, converting between different image formats, and more specialized tasks. Through this you can also create bump maps

10. Meshlab (mesh repair) open-source and free tool (Optional)

MeshLab is an advanced 3D mesh processing software system that is oriented to the management and processing of unstructured large meshes and provides a set of tools for editing, cleaning, healing.

11. LibreOffice (create documents) open-source and free tool

LibreOffice is a free and open source office suite, a project of The Document Foundation. It was forked from OpenOffice.org in 2010, which was an open-sourced version of the earlier StarOffice.

12. Atom (coding software) open-source and free tool

Atom is a free and open-source text and source code editor for macOS, Linux, and Microsoft Windows with support for plug-ins written in Node.js, and embedded Git Control, developed by GitHub.

Useful websites

free image

Reference images will be found on Pinterest

Free Sounds

1.      Freesound.org

2.      99Sounds.org

3.      NoiseForFun.com

4.      Incompetech.com

5.      OpenGameArt.org

6.      RaisedBeaches.com

7.      Musopen.org

8.      PlayonLoop.com

9.      Bensound.com

10.   SoundJay.com

11.   Dig.ccmixter.org

12.   Soundgator.com

13.   Pacdv.com

14.   Freesfx.co.uk

15.   Soundtrack.imphenzia.com

16.   Bxfr.net

Download the free music tracks from these websites

1. http://incompetech.com/music/

2. http://dig.ccmixter.org/

3. http://www.joshwoodward.com

4. http://www.youtube.com/audiolibrary

I hope this information will help full to you. I am got so stress to collect this data so don't waste it 

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1 hour ago, KARTHI said:

1. Lumberyard (Game engine) open-source and free tool

Lumberyard is known as the most difficult engine. Unreal 4 has the same power and is easier to use although it isn't aimed at beginners.

Unity is the easiest to use of the powerful engines.The trait off is that it's the weakest and needs either a experienced programmer or a lot of assets from it's store to make a AAA quality game.

Considering that a single person would take forever to make a AAA quality game Unity is the recommended starting engine for new developers.

1 hour ago, KARTHI said:

4. Ipi soft (motion capture software) not free tool

Blender already has better Motion tracking build inside. Blender is used by many commercial companies for motion capture.

Ipi soft is just a bit easier for beginners and not that much better.

1 hour ago, KARTHI said:

7. Awesome bump (bump map editor) open-source and free tool (optional)

Good software but optional. I still recommend it, it's good for beginners, but as you learn more you will use it less and less.

There are plugins for gimp that does the same and you already have Blender that can also do the same.

1 hour ago, KARTHI said:

8. Faceware (facial animation) not free tool

This is the company most AAA developer hire there motion capture gear from. They also sell the software but it comes in pieces. They do have a indie software option for $2475/ $3070.

At this price it's cheaper to hire a artist for face animations. There also is other Face animation software.

Blender has motion capture and it can be used for face animation, it's what I recommend you use while learning.

1 hour ago, KARTHI said:

10. Meshlab (mesh repair) open-source and free tool (Optional)

Blender and Sculptris has better tools for this and works better with games.

1 hour ago, KARTHI said:

11. LibreOffice (create documents) open-source and free tool

You can just use any typing software that your PC has. Readme documents are best as .txt files so that your user can always open them. For the same reason any in game dialog is best saved to a .txt so that fans who want to translate it can do so without breaking into the game.

Any text software can save as .txt

1 hour ago, KARTHI said:

12. Atom (coding software) open-source and free tool

Your engine will have one it works best with. Unreal works best with Visual studio and it's Blueprints; Unity works best with MonoDeveloper(Unity already has MonoDeveloper inside).

All you really need to start making 3D games is: Blender, Gimp and Unity. I recommend you start with these.