Welcome to RPOL.
If you're looking for a particular game, the best place to post is the
Wanted - GMs forum:
link to another game
Or you could try browsing
Wanted - Players for a game advertisement that fits your requirements:
link to another game
Finally, on the Main Page,
/ , there is a link in the lower half of the screen that lets you
Browse/Search the Games (including an option to specify which system you're interested in).