Improves quality of video played by most players -

Microsoft MediaPlayer, Light Alloy, JetAudio, Elecard MPEG Player, CliprexLite, RadLight -

realtime denoise and deinterlace soft

Alparysoft Video Quality Controller
http://www.alparysoft.com/prod/quality-controller.phtml

See also effective deinterlace freeware for video editing

Alparysoft Cleaner for Amateur Video
http://www.alparysoft.com/prod/video-cleaner.phtml

freeware for VirtualDub

AlparySoft Denoise Filter for VirtualDub
http://www.alparysoft.com/prod/denoise-for-vd.phtml

AlparySoft Deinterlace Filter for VirtualDub
http://www.alparysoft.com/prod/deinterlace-for-vd.phtml

http://shelob.mordor.net/dgraft/other.html