Free TACACS+ Servers

TACACS+ provides authentication, authorization, and accounting services for network devices. In simple terms this provides granular control over who has access (authentication), what that user is allowed to do (authorization) and keeps a log (accounting) of everything that user does.

Marc Huber has created and maintained a fantastic open source TACACS+ server for Linux available here: http://www.pro-bono-publico.de/projects/tac_plus.html

If you’re more inclined to the Windows world have a look here at a free TACACS+ server for Windows: http://www.tacacs.net