The Conference Calendar (TCC) was first conceived by ITEG, LLC in 1999. Listing every single educational technology related conference that could be found in the US, it was eagerly taken on and supported by the T.H.E Journal. Over the next decade TCC established itself as the industry's leading website for ed tech events. Today, TCC is independently managed by one of its original producers and expanding its service into the entire education industry.
Calendar app which lets you send colleagues/friends available dates for planning, parties, events and each person can choose which dates work for them.
SpiderScribe is an online mind mapping and brainstorming tool. It lets you organize your ideas by connecting notes, files, calendar events, etc. in free-form maps. You can collaborate and share those maps online!