TACACS+ server recommendations?

Ah, the good old days when I could download the latest tac_plus code from the Cisco FTP site, compile it, and off I go. But I digress. Curious if there are any operators out there that have a good recommendation on a lightweight TACACS+ server for ~200 NEs and access-control for 20-30 folks. Nothing too special, but some sort of simple command-control auth would be nice. Open-source is fine ... we've been looking at commercial options, but they're all pretty pricey and have way more features than we need. Thank you all in advance! - bryan