From TD-er's Wiki
The software we used is often freeware, or a (limited) trial.
- VoIPBuster Windows VoIPBuster client (free)
- Trixbox Linux distribution specially made for Asterisk, based on CentOS.
- X-lite (free) SIP-soft-phone
- H.323 Clients - Feature comparison chart
- List of free H323 softphones
- MyPhone (direct download link)
- Ethereal The world's most popular network protocol analyzer :P
Misc. Windows applications
- DV-driver This software emulates a webcam in Windows (accessible to multiple applications at the same time) and can show the stream from a normal DV-camcorder, or show a pre-recorded stream (played back from tape). The trial-version only allows you to use the cam for 5 minutes, after which the software has to reconnect to the camera. (trial)
- MWsnapshot Tool to create snapshots under Windows. (freeware)