A popular free implementation is Apache Hadoop.

This includes free implementation and technical support.

At the moment a consortium of several company are working on a free implementation of the above parameters.

Libntlm - a free implementation.

A free implementation of flash proxies is available.

A free implementation for smartphone and tablet is available here.

Netatalk is a free, open-source implementation of the AppleTalk suite of protocols.

Thus, a free implementation of VRRP could not be made.

Without these free implementations of the algorithm were out of question.

Both techniques are used in libdvbcsa, a free implementation of CSA.