DirectTalk for MSN Messenger makes it possible to do voice chat behind a NAT

ENat for MSN Messenger makes it possible to talk with anyone using MSN Messenger voice chat or video chat even when behind NATs where attempts to talk using MSN Messenger voice & video chat usually fail. It also enable file transfer when behind NATs.

MoBif VSoftMSN for Windows ® XP Services Pack 2

Keep your privacy and have fun by changing your voice to another voice. Record, capture all voices, music outputs in real time. Add, mix funny effects to your voice. Compatible with ICQ, Yahoo Messenger, AOL, MP3/DVD/CD players

Share music and fun with your friends while talking over IMs(Skype, Msn, AIM, Gtalk, YIM, QQ). vEmotion is an IM add-on, with which one can set background music for IM calls and send voice emotions/sound effects to partners.

Change your voice over Internet and PC2Phone. Record voice outputs in real time. Add effects to your voice. Keep your privacy on net by changing voice to male, female, teen, baby voice. Compatible with ICQ, Yahoo Messenger, AOL, MP3/DVD/CD players

vEmotion is a plugin for Instant Messengers. It add sound effects to and set background music for voice conversations. Also it records calls into audio files for future review. Enabled IMs include Skype, Msn, Gtalk, AIM, Yahoo Messenger and QQ.

Backup or restore MSN Winks, Moods, MSN Dynamic Backgrounds for Your MSN Messenger. Re-install MSN winks, moods, MSN Dynamic Backgrounds in different accounts or different computers; Share them with your friends or share them in Internet.