We currently offer a massive range of downloads for FSX, as well as older flight simulator add-ons for the ever-popular FS2004, FS2002, CFS3 and now becoming ever popular with dediced virtual aviators is Laminar Research's X-Plane series.
For the freeware camera, I know there's F1 View (not the key F1...its's a download). If all you are looking for the be able to move around in the cockpit (as opposed to the cabin), just use the different view commands using Enter, Backspace, Shift, and Control. As for the ATC, there is Radar Contact, but it's pretty expensive and that kind of defeats the purpose of looking for a freeware camera. Also, Radar Contact is more for flying airliners and such, no VFR flights. If this isn't an option maybe try EditVoicePack. This is freeware, but I don't know if this changes the accents or not.