A new version of the compositing library ParaComp was just released. Old-timers might remember this library as PICA.
Most notably, this release adds the necessary hooks for Equalizer, and Equalizer 0.6 will use Paracomp on Linux for alpha-blending. Right now this is the only mode where Paracomp is faster than the Equalizer default implementation, but I’m sure more will be added over time.
Kudos to the ParaComp team!