1. openculture.com - videos about cultural, scientific topics and other curiosities
2. http://developer.ubuntu.com/get-started/ - introduction to open source programming in python
3. screenr.com – record movies of your desktop and send them straight to YouTube.
4. copypastecharacter.com – copy special characters that aren’t on your keyboard.
5. lovelycharts.com – create flowcharts, network diagrams, sitemaps, etc.
6. iconfinder.com – the best place to find icons of all sizes.
7. office.com – download templates, clipart and images for your Office documents.
8. openoffice.org or libreoffice.org - open source alternatives to ms-office.
9. gimp.org - open source alternative to adobe photoshop.
10. followupthen.com – the easiest way to setup email reminders.
11. jotti.org – scan any suspicious file or email attachment for viruses.
12. wolframalpha.com – gets answers directly without searching.
13. pdfescape.com – lets you can quickly edit PDFs in the browser itself.
14. tubemogul.com – simultaneously upload videos to YouTube and other video sites.
15. ctrlq.org/dictation – online voice recognition in the browser itself.
16. sizeasy.com – visualize and compare the size of any product.
17. myfonts.com/WhatTheFont – quickly determine the font name from an image.
18. google.com/webfonts – a good collection of open source fonts.
19. regex.info – find data hidden in your photographs.
20. livestream.com – broadcast events live over the web, including your desktop screen.
21. homestyler.com – design from scratch or re-model your home in 3d.
22. join.me – share you screen with anyone over the web.
23. onlineocr.net – recognize text from scanned PDFs.
24. flightstats.com – Track flight status at airports worldwide.
25. wetransfer.com – for sharing really big files online.
26. hundredzeros.com – the site lets you download free Kindle books.
27. polishmywriting.com – check your writing for spelling or grammatical errors.
28. typewith.me – work on the same document with multiple people.
29. noteflight.com – print music sheets, write your own music online
30. imo.im – chat with your buddies on Skype, Facebook, Google Talk, etc. from one place.
31. translate.google.com – translate web pages, PDFs and Office documents.
32. similarsites.com – discover new sites that are similar to what you like already.
33. bubbl.us – create mind-maps, brainstorm ideas in the browser.
34. faxzero.com – send an online fax for free (do people still send faxes?).
35. pipebytes.com – transfer files of any size without uploading to a third-party server.
36. tinychat.com – setup a private chat room in micro-seconds.
37. chipin.com – when you need to raise funds online for an event or a cause.
38. aviary.com/myna – an online audio editor that lets record, and remix audio clips online.
39. sxc.hu – download stock images absolutely free.
40. mailvu.com – send video emails to anyone using your web cam.
41. timerime.com – create timelines with audio, video and images.
42. stupeflix.com – make a movie out of your images, audio and video clips.
43. safeweb.norton.com – check the trust level of any website.
44. teuxdeux.com – a beautiful to-do app that looks like your paper dairy.
45. minutes.io – quickly capture effective notes during meetings.
46. youtube.com/leanback – Watch YouTube channels in TV mode.
47. builtwith.com – find the technology stack of any website.
48. mixlr.com – broadcast live audio over the web.
49. ctrlq.org/html-mail – send rich-text mails to anyone, anonymously.
50. seekingalpha.com - miscellaneous investing ideas from all styles of investors.
51. handbrake.fr - video transcoding software.
52. http://audacity.sourceforge.net/ - audio recording and editing software.
53. gnucash.org - opensource accounting and personal finance software.