So one interesting thing to look at with Mint or any other site traffic analytics application is where traffic comes from. A lot of it comes from searches and a popular one here is “Open Source SIP client for Mac OS X”.
That’s something I was researching when I was interviewing for a startup a few years back (took the job at BzzAgent instead).
Anyway, I surveyed the field again recently and it seems that OpenWengo remains the most active and solid open source (GPL 2) SIP client for Mac OS X. Builds are available for Mac OS X (Intel and PPC but no universal) as well as Windows and Linux. The Firefox extension is pretty cool to, I have been using it a bit, with success (Update: Neary points out it’s not been updated in a while but it still works at home, heh).