LDAPd looks pretty cool. It is a Java based LDAP implementation, based on SEDA (which I liked when I first read the paper, but I’ve never actually seen used anywhere) and Apache Phoenix, which strikes fear into my heart.
Actually, Phoenix (and Avalon as a whole) always seems very cool, but there is more politics per line of code than probably any project I’ve seen (including legendary flamefests like EMACS vs XEMACS and the OpenBSD split from NetBSD).
Don’t let that put you off, though! The code itself seems to be pretty decent, and a LDAP server would be useful for quite a lot of things.