Available as an assembled Module and as a DIY project.
This Module is currently available.
A compressor specifically designed for the eurorack: Sidechain it, duck it, squash it and crush it in either FET or vactrol modes.
http://godsbox.co.uk/lollipop.html
Included in 1 Racks, 1 are public:
Fender Player II Mustang Bass PJ
Hairball Audio FET/RACK Revision A
MXR M238 Iso Brick
Martin 0017 Authentic 1931 VTS GRW
Gotharman's Zaturn
Numark Mixtrack Platinum 2-Channel