In my previous job we had a team dedicated to Audio/Visual enhancement for CCTV footage and various other types of media. You have asked a very basic question for a very complex field. Can you be specific? What do you have?
FreeFall Tournament is a space marines themed TPS (third person shooter). Intense, fast-paced, team combat. Animation, effects, and camera control that make you. FreeFall Tournament is a fast-paced, space marines third person shooter (TPS). It's a free to play browser game made by Free Range Games in Unity 3D. Unique combat and balance separates this sci-fi action game from other FPS. Y8 freefall tournament game.
Pinoy tongue twisters. The app includes popular Tongue Twisters: ★ Ang relo ni Leroy ay rolex ♥ Pitumput pitong puting tupa ♥ Makina ni Monika (Mekaniko:P ) ✓ Bra ni Barbara ✓ Pansiteria ✓ Susi ni Susan ★ and many more! If you are Filipino or if your friend is from Philippines, they will really laugh SO HARD on these! We made this app for personal use that we wanted to bring handy notes of our Tagalog Tongue Twisters. This game is popular too during the 'Buwan ng wika' or National Language Month for us Filipino.
This forensic video enhancement software is developed for Windows users and can also be used by investigators and law enforcement officials. This free, professional grade video enhancement tool comes without any ads to distract you and a detailed information.
(ie Jpeg, AVI, MPEG etc) Where did it come from? Quality (how many channels etc if you know, stereo/analog/DTS, HD, Codecs in use)? What are you trying to accomplish?
Free Forensic Image Enhancement Software Download
I know from experience is you have low quality video/audio and you are trying to clean up background noise then you will have very little chance. How much you can manipulate a picture or video file depends very largely on the quality of what you have to work with. 
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Free Security Video Enhancement Software
They are Starwitness and Cognitech. There is a steep learning curve with the latter. Both systems will work with any video that can be fed into them i.e. Analog or digital. Ocean Systems have some good plugins for AVID Media Composer and Photoshop. Adobe CS production suite can also do some good things.