The answer to all your PrC questions is here:
www.crystalkeep.com/d20/index.html Check the Index of Prestige Classes (3.0) PDF.
A quick search of that file reveals the following.
Combat Casting -
* Dweomer Keeper (specialty priest of the Deity of Magic) (F&P p189)
* Sacred Fist (temple protectors who vow to not use weapons) (DotF p70)(DR286 p97)+
Great Fortitude -
* Night’s Watch Ranger (wilderness guards assigned to the frozen North) (DR307 p84)
Weapon Focus -
* Brawler (expert in fighting with improvised weapons against groups of people) (DR295 p72)
* Breachgnome (a gnome warrior who specializes in fighting next to walls, in tight corridors, etc.) (RoF p181)
* Dweomer Keeper
* Green Hunter (specialty templars of the Deity of Jungles, who specialize in tracking through heavy terrain & fighting with Spiked Gauntlets) (DR294 p69)
* Guild Thief (a thief who has advanced in the guild) (FR p45)
* Harper Priest (member of the Harpers who is a divine caster) (MoF p29)
* War Wizard of Cormyr (battle field wizard who eventually learn to enlarge spells on-the-fly) (MoF p40)
Most of the source abbreviations should be self-explanatory, but see the PDF on Crystal Keep for any questions.