I never participated in any game jams, and I have few questions:

1. Which way I have build project? (windows, WebGL, etc)

2. Do I have give source code, (I think probably yes), and where? (github?)

3. Do I need write somewhere, which programs I used to create game? (like, Photoshop, unity, sfxr,etc)

You can build projects anyway you want, any engine any language...

If it a small project you could use WebGL, or you could use downloadable files to run larger version.

About the 2nd and 3rd one, I don't know... Someone else will probably answer it

I don't think you need source code. You can write in the description of the project what you made it with or when submitting there might be a question where you put what engine you used and other apps