Can I Use
caniuse.com
Answers whether a browser feature is safe to ship yet
No sign-upClassic
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Entries from the original useful-website lists that are still standing.
34 sites in this collection
caniuse.com
Answers whether a browser feature is safe to ship yet
codepen.io
Write HTML, CSS and JavaScript in a tab and watch it render live
diagrams.net
Full diagram editor that works without an account or a saved file
doodle.com
Propose several times and let a group tick the ones that work for them
downforeveryoneorjustme.com
Settles whether a site is actually down or only down for you
fontsquirrel.com
Free fonts hand-checked for a genuinely commercial licence
glassdoor.com
Salary ranges and employee reviews for a company before you interview
docs.google.com
Several people typing in one document without overwriting each other
imdb.com
The full credits, dates and trivia for basically everything ever filmed
imslp.org
Free scanned sheet music for almost the entire classical repertoire
lipsum.com
Generates the placeholder Latin by paragraph, word or byte
metronomeonline.com
A metronome that starts clicking the moment the page loads
ocw.mit.edu
Publishes the real lecture notes, problem sets and exams from MIT courses
music-map.com
Type one band and get a cloud of the artists people who like them also like
onelook.com
Finds the word you mean when you can only describe it
onetimesecret.com
Puts a secret behind a link that destroys itself once it is opened
pastebin.com
Drops a block of text or code at a short URL you can send to anyone
pdfescape.com
The 2007 browser PDF editor that still fills awkward government forms
pixlr.com
The 2008 browser photo editor, now split into a simple and an advanced one
printfriendly.com
Strips ads and navigation off a page so you can print or save it as a PDF
gutenberg.org
Seventy thousand out-of-copyright books as clean EPUB, Kindle and plain text
ssllabs.com
Grades a site's TLS configuration from A+ down to F and says why
regex101.com
Builds and explains a regular expression while you type it
simplenote.com
Plain-text notes that sync everywhere and never ask you to format anything
seat61.com
One man's hand-written guide to reaching anywhere by train and ferry
trello.com
Drag cards between columns to see where every piece of work has got to
vocaroo.com
Press record, get a link to the audio, send it to someone
web.archive.org
Shows you what a web page looked like on a date in the past
webpagetest.org
Loads your page from a chosen city and browser and films the result
wetransfer.com
Drop a file, type two email addresses, and it sends a download link
when2meet.com
Paint your free hours on a grid and watch the group overlap darken
wolframalpha.com
Answers a maths, science or unit question typed as an ordinary sentence
xe.com
The exchange rate everyone quotes, live across a hundred-odd currencies
zamzar.com
The email-me-the-converted-file service from 2006, still converting