I created Combat Zone Fire Team back in 2006, when after playing many RPGs regularly since 1980 (Twilight 2000, Runequest, Call of Cthulhu, Paranoia, Traveller, etc) to name a few, I decided to create my own. 
Started playing late 70's.
Even now (7 years later), I'm still tweaking it here and there. 

It is basically a D100 system. 

I've added 'themes' to the rules (pulp, western, sci-fi, fantasy, etc). 

I primarily created it for myself and a few others, but, over the years, others have become interested and added their input (many thanks to them). 

Hopefully, in time, others will also add their ideas.