BlitzKibitz is a C/C++ chess engine originally started as a university project and continues to be developed. BlitzKibitz doesn't have it's own interface but it is compatible with XBoard protocol.
Currently there is no time management. The only limiting factor is the maximum depth the engine searches. For 15 min games it goes to about 6-7 plies, while for 5 min games we will build a binary that goes to 5-6 plies. We plan to change this to be time constrained.