Any GM tools to play online with?

I’m going to play a game online, and was wondering if anyone has any recommendations for online tools would be useful to play over G+ Hangouts…

Dice rollers are great there some really good one out there. Also banners and images of all kind…Facebook groups are amazingly good to organise lore, schedule and provide some good momentum as well.

My online group has gotten a lot of mileage out of this dice roller app. It’s simple to the point of minimalistic, but in my experience, the more advanced dice rollers typically fail to make up in functionality what they loose in complication.