Tracter is a data flow framework.
It was written initially for doing speech signal processing in the context of Juicer. It has developed into more of a wrapper for other packages. For instance, it can generate HTK features by linking with HTK's library. Written and maintained at Idiap, tracter contains contributions from other AMIDA partners at the universities of Sheffield and Brno.
Tracter is described in the following paper:
Tracter: A Lightweight Dataflow Framework
The tracter code base is available on GitHub.