You could get HL2: Deathmatch free by using the Steam ATI or NVidia offer. It is a Source game and should work with Garry's Mod. Find the offers below.
No you need the full game or any other source engine
No
Check your "Options" to make sure the spray you want is still set.
There is a PCSX2 emulation program that needs a PS2 Bios to work. It or any other program will not play games as well or trouble free as a PS2 does
Lots of flash games involve shooting, these websites work quite well for this: www.addictinggames.com/shooting-games/index.jsp and miniclip.com, you could also try www.gunshootinggames.net/.
You can find free childrens games on any on line gaming site that is free; there are such sites like pogo, and online games, both which are free to play.
yes there are
There are free games on iTunes, and pretty much any app store.
Dc Universe is free to play and free to roam.
Yes, you can download demos for free. Also, if you qualify for the ambassador program, you can get a few free GBA games
:3 nope
Dragonfable.com