I have started a new open source project: The Digest Software Project. It’s a small project where I develop two tiny libraries, libdigest and libpam-digestfile.
libdigest is a C library which generates RFC2617-compliant digests, used by Apache and others.
libpam-digestfile is a Pluggable Authentication Module which lets you use an arbitrarily-named text file similar in structure to /etc/passwd to authenticate users but using digested passwords (see RFC 2617 for more information about the digest algorithm).
Both libraries are stable and in production.