Nobody_009

Also, regarding the game database, Mobygames has the biggest one of all, but some newer games, and especially indie games are more likely to be found on IGDB.

Are you talking about a page showing all the game engines? There is this page, and you can click on one to open that engine's page and see all the games that use it. There is currently no way to access that page I linked, but you can access a specific engine's page by clicking on the engine in the "extended information" box on a game's page.

Yes it's safe. There currently are no ads on the website. If you like you can donate the site, there is a link in the top navigation bar. You can also contribute by adding information about games/companies/people, giving feedback about the site, or even just by rating games and participating in the forums, which would help in growing the community.

well, you could always add the game yourself. Who better to add accurate info on the game than someone who worked on it. You have direct access to game info and media that others might have a hard time finding.

Yes, every game page has an "Extended Information" box a bit down the page, below the gallery. It will show the engine(s) that game uses if that information has been entered in the site.