SuperCook.Com – Search Recipes By Ingredients
Privnote.Com – Write Notes To Someone That Will Destroy Itself Once He Reads It.
Coffitivity.Com – Feeling Alone At Home, Free Murmur Sounds
Gifyoutube.Com – Convert Youtube Videos To GIF
Ninite.Com – Install All Required Softwares At Once Install and update all selected useful programs at once on your PC.
CopyPasteCharacter.Com – Copy Paste Special Character
Duolingo.Com – Learn New Languages For Free And In An Interesting Way
Squirt.Io – Discover A New Way Of Reading
Shouldiremoveit.Com – Choose Which Software You Should Remove From Your PC
OldVersion.Com – Find Out Older Version Of Any Software
Deadmansswitch.net – Send Emails When You Are Dead
PrintFriendly.com – Print Any Web Page In A Print Friendly Format
PrintWhatYouLike.Com – Print Exactly What You Like In A Page
FreeCycle.Org – Find Free Things In Your Town Which People Are Willing To Give Away
CouchSurfing.com – The Name Explains It
Wolframalpha.Com – Computational Search For Your Keywords
SimplyNoise.Com – Just Plain Sounds To Help You Sleep
CamelCamelCamel.Com – Price Drop Alert For Big ECommerce Websites
Ptable.Com – Periodic Table Made Easy
Scribblemaps.Com – Just Draw And Mark On Google Maps And Share Them
Rhymer.Com – Find Rhyme For Any Word ! Cool Tool For Poets
WeTransfer.Com – Send Large Files Up To 2 GB For Free
QClock.com – Find Local Time Of A Place
PdfEditor.com – Edit PDF Online
Projectnaptha.Com – Delete Text From Images
Namechk.Com – Simultaneously Search Username Availability At All Websites
JustDelete.Me – Collection Of Direct Links To Delete Your Profile At Websites
Sleepyti.Me – Find Out When You Should Go To Bed For Sleeping
HaveIBeenPwned.Com – Find Out Whether Your Email Is Leaked In Past Hack Attacks
Sumopaint.Com – Use Microsoft Paint Like Software Online
Magastack.Com – Read Magazines For Free
FatFingers.Com – Find Ebay Items With Typing Errors And Thus Low Bid
HotelWiFiTest.Com – Find Hotels And Rank Them According To Wi Fi Speed. Good For Internet Loving Travelers.
SkiPlagged.Com – Find Cheapest Flights In Nearest Date Range
PushBullet.Com – Phone Notification On Your Desktop
Wtfsigte.Com – Find Out Your Eating Location Mingled With The F Word
Documentaryheaven.Com – A Heaven For Docu Lovers
Archive Movies – Watch Free Films And Documentaries
Pastebin.Com – Paste Any Text Instantly
Mixlr.Com – Create Live Audio Broadcast
Minutes.Io -Quick And Effective Minutes Of A Meeting
Urbandictionary.Com – Find Meanings Of Slang And Modern Used Words
Draw.Io – Draw Useful Diagrams Online And Save To Your PC
Strangermeetup.Com – Random Chat With Strangers Anonymously
Faxzero.Com – Send Free Fax Online
Midomi.Com – Remember The Name Of The Song
12ft.io – Gets around paywalls (courtesy of @RulesOfImgur)
millionshort.com – lets you filter out scumbag sites when looking for obscure things (courtesy of @MMythIncarnate)