Join.me is an online meeting and screen sharing tool from the folks behing LogMeIn. The company bills the service it as "ridiculously simple," and it's tough to find fault with the claim. It's easy and on-demand: no muss, no fuss. The free version is pretty much instant--no sign-up required--and can meet most basic screen sharing needs for up to 250 participants. The Pro option includes a heartier mix of tools for scheduling, presenting, and managing online meetings for $19 a month or $149 a year. (Join.me knocks something off the price for those willing to pony up annually.) Both versions support iOS and Android devices.