Cryptocat allows you to set up secure and encrypted chat rooms.

FollowUp is a service that allows you to schedule automated reminders simply by sending emails to a specific "@followup.cc" email address, instead of using a traditional To Do list.

Ecosia is a green search engine. Sponsors have agreed to donate money to support the Amazon forest when users click on their links.

EveryTrail is a hiking trail database.

Mapnificent uses Google Maps to show you where public transportation can take you within numerous cities.

Prey is a silent tracking program that you can install on your computer. If your computer goes missing, you can log in to their website to help track it down when it reconnects to the Internet.

A software collection by Lifehacker for Linux users.

A Google a Day posts a question each day that you must use Google's search techniques to find the answer to. The cool thing is that it freezes the search results from the day the question was posted, so you can't search for the answer directly.

Photorank.me is like Klout for photos. It rates a user based on their photo-sharing exposure.

A calculator to figure out how many watts you need to power your computer.