Mod_auth_tacacs currently has own tacacs+ code, it supports authorization and accounting too, so you can manage user access rights and control authentications via tacacs+ server.
This project was originally written by Roman Volkov as part of other project - libtacplus. Now this is separate project and it maintained by Ronan-Yann Lorin.
Please, use tools from SourceForge at mod_auth_tacacs Sourceforge home for support, discussions and requests.