Netbeans Pure Java CVS Client
The original code source is located in Netbeans Mercurial repository (http://hg.netbeans.org/main-golden/file/eb6502291467/lib.cvsclient) but it is so slooow that I decided to migrate it to Github.
License of this code is GPLv2/CDDL (https://netbeans.org/cddl-gplv2.html)