[cannam]

My first thought was "older? really?" - but hosted at SourceForge, I guess it could be.

I started using offlineimap in 2008, which feels like a long time ago but of course is a lot more recent than the first appearance of imap.

[jwilk]

The first version of isync (0.1) was released in 2000.

The first version of offlineimap (1.0) was released in 2002.

[zargon]

I remember using OfflineIMAP in 2002. It's pretty old.