Is there a migration tool from CVS to Git?

The only tool that has incremental import seems to be git-cvsimport. If you want to convert (migrate) from CVS to Git, the best solution for now seems to be mentioned above cvs2git mode of cvs2svn.

See also Interfaces Frontends And Tools page on Git wiki, section about interaction with other revision control systems.

cvs2svn has a cvs2git mode.

An alternative might be to use git cvsimport *

I've not tried this myself, but friends have reported good success converting first from CVS to SVN, and then from SVN to Git. It seems that the tools to do those respective transitions have been more thoroughly shaken out than a direct CVS to Git transition.

I'm the maintainer of cvs-fast-export. I used to maintain cvsps and parse2cvs and have closely evaluated cvs-fastimport and cvs2git.

CVS to git conversion is a hard, nasty problem with rebarbative edge cases. All the existing conversion tools have known limitations, some quite serious.

I recommend trying cvs-fast-export first. It produces better, faster conversions than anything else, except in rare cases where it fails cleanly and bails out. If you get the rare but dreaded "branch cycle error", try cvs2git.

Do not trust cvs-fastimport, it is quite buggy and often screws up branch joins.

For more, see http://www.catb.org/esr/cvs-fast-export/

You can add fromcvs to the list. It converts well and is extremely fast and also incremental. It does not do sticky tags, only branches, however.