If you need another product/service to compare with Slack, take a look at Flowdock. I actually used it at work before Slack. It's very similar, so if you just want something comparable to list side-by-side, it's ideal as it's a direct competitor.
I am in Camp Envy chats. This your there are 2. Here is the new one https://www.flowdock.com/app/campenvy/public And there is a chat which was part of the old UStream feed. No UStream though, the YT is far better http://www.ustream.tv/channel/campenvy
Something I can really recommend is flowdock. It's amazing especially for over-seas communication. They also integrate to a ton of other tools.
From todo lists I prefer Pivotal Tracker for bigger projects.