ARGH, any way I can find a anti spam guestbook?

Ok, if you didn't know, HTML Gear is closing. I'd used them for guestbooks on my personal pages for a long time.

However they're closing, so I took them off. The service I switched to said they were anti spam but..

First entry I get is spam. It's proly time to start hosting the guestbook on my own server since I can. Mind, I have access to recapatcha which seems to stop most spammers. Is there any scripts out there that'd allow that?