Is anyway to configure roundcube to connect to a APOP using SSL mail server?
If yes, how should I do this?
No Roundcube is IMAP only.
Is there any project like roundcube for APOP?
Not that I'm aware of, the problem of course is that with POP you need to store mail until IMAP where it can be accessed on the mail server. If you absolutely had to have it you could setup an IMAP mail server with getmail which would fetch the mail from the POP server and store it in the IMAP mail server which Roundcube could then access.