Lap is a project mainly written in C++ and RUBY, it's free.
Lexi asset pipeline
LAP
Install using rcmake
ruby rcmake.rb
LAP is a work in progress*, but provides a set of primitive operations for processing triangles meshes. Application wise lapquery is probably the most interesting atm.
In time LAP will live up to its acronym as a full asset pipeline, just no guarantees about it being on github.
*and partly an experiment, 'what if I rewrote some existing code more generically?' behold the result, lots and lots of little functions and adapters and massive improvement on its counterpart.