It's in the altcoin market place. They post their bounty campaigns on there and you just have to navigate through. It's a little tough at first but once you get use to it you'll know which post are new or old, meaning which ones are still active and not. If you do not know how to get to the altcoins marketplace I posted a link.
https://bitcointalk.org/index.php?board=161.0
Hope this help.