1. marker.to – Highlight stuff on webpages then share it.
2. iruler.net – An online ruler.
3. howstuffworks.com – A collection of explanations for how every single thing in the world works.
4. govdeals.com – Buy stuff from the government on the cheap.
5. isitback.com – Get information on the return of your favorite television shows.
6. explainxkcd.com – A wiki for explaining XKCD comics.
7. wheresmycellphone.com – Call your lost cellphone.
8. differencebetween.net – Learn the difference between things.
9. whosampled.com – Discover music through samples, cover songs, and remixes.
10. disposablewebpage.com – Create a disposable webpage in just a few keystrokes.
11. tineye.com – A reverse image search.
12. pdfgeni.com – A PDF search engine.
13. reruncheck.com – Find out if the television show you want to watch is a repeat this week.
14. howsecureismypassword.net – Test your password making skills.
15. getnotify.com – Get notified when the email you sent is read.
16. scr.im – Share your email without getting spammed.