I have been reading about Tetrahedral Mesh Refinement algorithms, but the literature covering this is very wide. My work involves implementation of different 3D computational geometry algorithms, and I have often experienced that an algorithm with very good theoretical complexity may be an implementational nightmare. Apart from the most cited articles (e.g. Shewchuk et al, and Si), what algorithms (with references please) are implemented in the open source mesh refinement libraries?
Ideally, the dynamical refinement algorithm should be Delaunay, because this allows tetrahedral cell agglomeration into polyhedral cells which then remain convex.