We have collection of more than 1 Million open source products ranging from Enterprise product to
small libraries in all platforms. We aggregate information from all open source repositories.
Search and find the best for your needs. Check out projects section.
There are many sites using OpenID as alternative login method. The application is for CA's (e.g. CAcert) and service providers which would implement an OpenID provider for their client certs. You could use a X.509 certificate to login to an OpenID site.