There is numerous applications that would benefit from central authentication and this page hopes to generate a wish list (and maybe some interest from application developers).

• DropBear SSHd, is widely used in OpenWRT and similar projects due to it's small requirements, not sure how hard it would be to add RADIUS code to enable it to authenticate centrally
• Various WIKI implementations, mediawiki (used here) supports 3rd party authentication and I've coded a RADIUS authentication method but it fails to fall back to normal password authentication.