MSRLM -- open source toolkit from MSR, Microsoft Research!

MSR LM paper and code link at Microsoft

A new LM toolkit from MIT by Bo-June (Paul) Hsu

MITLM at Google Code

-- see a paper in Papers, too.

Advanced LM claiming some advantages over SRILM -- see description in Papers, code on SourceForge:

IRSTLM on SourceForge

Our favorite, the trusted workhorse. Prepares counts in an efficient way, used by MIT LM and others. Baseline mature implementation, many features -- model combining, lattice rescoring.

SRI LM at Stanford Research Institute