Here is a little list thrown together of 101 useful websites;-
downforeveryoneorjustme.com – find if your favorite website is offline or not?
urbandictionary.com – find definitions of slangs and informal words.
dictation.io – online voice recognition in the browser itself.
youtube.com/disco – quickly create a video playlist of your favorite artist.
wolframalpha.com – gets answers directly without searching – see more wolfram tips.
typewith.me – work on the same document with multiple people.
zoom.it – view very high-resolution images in your browser without scrolling.
kuler.adobe.com – get color ideas, also extract colors from photographs.
scr.im – share you email address online without worrying about spam.
disposablewebpage.com – create a temporary web page that self-destruct.
mixlr.com – broadcast live audio over the web.
liveshare.com – share your photos in an album instantly.
office.com – download templates, clipart and images for your Office documents.
unfurlr.com – find the original URL that’s hiding behind a short URL.
join.me – share you screen with anyone over the web.
ctrql.rss – a search engine for RSS feeds.
gtmetrix.com – the perfect tool for measuring your site performance online.
google.com/webfonts – a good collection of open source fonts.
everytimezone.com – a less confusing view of the world time zones.
tiny.ee – a url shortening service with free api.
draw.io – create diagrams and flowcharts in the browser, export your drawings to Google Drive and Dropbox.
boxoh.com – track the status of any shipment on Google Maps – alternative.
ctrlq.save – save online files to Dropbox or Google Drive directly.
otixo.com – easily manage your online files on Dropbox, Google Docs, etc.
wordle.net – quick summarize long pieces of text with tag clouds.
picmonkey.com – Picnik is offline but PicMonkey is an even better image editor.
seatguru.com – consult this site before choosing a seat for your next flight.
safeweb.norton.com – check the trust level of any website.
fiverr.com – hire people to do little things for $5.
qlock.com – find the local time of a city using Google Maps.
similarsites.com – discover new sites that are similar to what you like already.
screenr.com – record movies of your desktop and send them straight to YouTube.
zerodollarmovies.com – find full-length movies on YouTube.
mondrian.io – create vector drawings in the browser
myfonts.com/WhatTheFont – quickly determine the font name from an image.
tagmydoc.com – add QR codes to your documents and presentations (review).
random.org – pick random numbers, flip coins, and more.
pdfescape.com – lets you can quickly edit PDFs in the browser itself.
hundredzeros.com – the site lets you download free Kindle books.
minutes.io – quickly capture effective notes during meetings.
feedmyinbox.com – get RSS feeds as an email newsletter.
faxzero.com – send an online fax for free – see more fax services.
imo.im – chat with your buddies on Skype, Facebook, Google Talk, etc. from one place.
livestream.com – broadcast events live over the web, including your desktop screen.
teuxdeux.com – a beautiful to-do app that looks like your paper dairy.
google.com/history – see your past searches, also among most important Google URLs
privnote.com – create text notes that will self-destruct after being read.
stupeflix.com – make a movie out of your images, audio and video clips.
bubbl.us – create mind-maps, brainstorm ideas in the browser.
printwhatyoulike.com – print web pages without the clutter.
tinychat.com – setup a private chat room in micro-seconds.
radbox.me – bookmark online videos and watch them later (review).
scribblemaps.com – create custom Google Maps easily.
mailvu.com – send video emails to anyone using your web cam.
whoishostingthis.com – find the web host of any website.
iwantmyname.com – helps you search domains across all TLDs.
youtube.com/leanback – Watch YouTube channels in TV mode.
tubemogul.com – simultaneously upload videos to YouTube and other video sites.
snopes.com – find if that email offer you received is real or just another scam.
kleki.com – create paintings and sketches with a wide variety of brushes.
notes.io – the easiest way to write short text notes in the browser.
coralcdn.org – if a site is down due to heavy traffic, try accessing it through coral CDN.
flightstats.com – Track flight status at airports worldwide.
copypastecharacter.com – copy special characters that aren’t on your keyboard.
ctrlq.org/html-mail – send rich-text mails to anyone, anonymously.
regex.info – find data hidden in your photographs – see more EXIF tools.
lmgtfy.com – when your friends are too lazy to use Google on their own.
unsplash.com – download images absolutely free.
homestyler.com – design from scratch or re-model your home in 3d.
lovelycharts.com – create flowcharts, network diagrams, sitemaps, etc.
followupthen.com – the easiest way to setup email reminders.
polishmywriting.com – check your writing for spelling or grammatical errors.
codeacademy.com – the best place to learn coding online.
noteflight.com – print music sheets, write your own music online (review).
midomi.com – when you need to find the name of a song.
onlineocr.net – recognize text from scanned PDFs – see other OCR tools.
jotti.org – scan any suspicious file or email attachment for viruses.
builtwith.com – find the technology stack to know everything about a website.
deadurl.com – you’ll need this when your bookmarked web pages are deleted.
wetransfer.com – for sharing really big files online.
e.ggtimer.com – a simple online timer for your daily needs.
alertful.com – quickly setup email reminders for important events.
typingweb.com – master touch-typing with these practice sessions.
talltweets.com – Send tweets longer than 140 characters.
pipebytes.com – transfer files of any size without uploading to a third-party server.
ewhois.com – find the other websites of a person with reverse Analytics lookup.
spypig.com – now get read receipts for your email.
timerime.com – create timelines with audio, video and images.
ge.tt – qiuckly send a file to someone, they can even preview it before downloading.
goo.gl – shorten long URLs and convert URLs into QR codes.
iconfinder.com – find icons of all sizes.
pancake.io – create a free and simple website using your Dropbox account.
translate.google.com – translate web pages, PDFs and Office documents.
marker.to – easily highlight the important parts of a web page for sharing.
sumopaint.com – an excellent layer-based online image editor.
ctrlq.org/screenshots – for capturing screenshots of web pages on mobile and desktops.
whichdateworks.com – planning an event? find a date that works for all.
formspring.me – you can ask or answer personal questions here.
ifttt.com – create a connection between all your online accounts.
bing.com/images – automatically find perfectly-sized wallpapers for mobiles.
woorank.com – research a website from the SEO perspective.
If you come across one that doesn't work. Drop me a tweet and I'll either replace it with something just as awesome, or strike it out.