[karlgrz]

The CALF Plugins are pretty excellent, for the most part. Those are free (as in beer and as in speech, IIRC).

http://calf-studio-gear.org/

[dvirsky]

Those were the main ones I worked with, plus another commercial package, I forgot its name, which was decent.

The Calf compressor and bass enhancer were very good. I'm seeing that a lot of plugins have been added in the time since I last worked with Ardour. Makes me want to start making music again :)

[karlgrz]

Nothing like knocking the rust off :-)

[ristic]

Unfortunately, the CALF series have been notorious for having problems or causing crashes in the past. If you do want to try it out, I highly recommend getting the latest version or building from git as a lot of distributions package an older version in their repositories.

[dvirsky]

I actually didn't experience that issue.