Norton Internet Security (including Norton Anti-Virus) has a very effective Parental Control option that is also regularly up-dated...

As far as Gnutella Network 'clients' (programs) are concerned, BearShare definitely has a Parental Control feature as standard...
But, don't forget to disable it for your own searches as you may suffer from excessive filtering of some file names.

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Fusion for REAL!--CDex 1.51--Wackyuses--Bitzi - Check Files Before Download !--.mp3 File Name Change Problems? Try Rename-It!--Alternate PORTS--Avast- Anti-Virus--WindowWasher--IrfanView--PC Pitstop - Test your PC !--Mac OSX Troubleshooting--GO .ape ! - For 'Lossless' Audio Compression--Port :6346 - Test If It Is 'Blocked'--Cole2k Codecs--OldVersion - Newer isn't always better !
Nod32 - Free Virus Scan: Use ESET's Online Antivirus Scanner

Tomorrow's forecast:
Sunni in places, Shi'ite in others...