Nr. 1: Google Font Directory

Google Font Directory

- The Google Font Directory lets you browse all the fonts available via the Google Font API.

Nr. 2: App Inventor

App Inventor

- App Inventor is built on the idea that you do not need to be a developer to build great mobile applications.

Nr. 3: paper.li

paper.li

- Read a Twitter stream as a daily newspaper.

Runners-Up:

Fiverr Fiverr

- The place for people to share things they’re willing to do for $5.

historypin historypin

- Historypin is a like a digital time machine that allows people to view and share their personal history in a totally new way.

WooRank WooRank

- a simple yet powerful website analysis tool meant to leverage search engines.

Lyrics Training Lyrics Training

- Improving your foreign languages skills.

WordItOut WordItOut

- Transform your text into word clouds.

iSendr iSendr

- iSendr lets you send files to your friends directly, without uploading to a server.

Preceden Preceden

- Preceden is a web-based tool that lets you you make simple, powerful timelines for just about anything.

Full list (ranked by the number of bookmarks at delicious):

  1. google-font-directory (8487 overall)
  2. appinventor (4005 overall) XX
  3. paper.li (2732 overall)
  4. fiverr (2157 overall)
  5. historypin (1959 overall)
  6. woorank (1895 overall)
  7. lyricstraining (1663 overall)
  8. worditout (1503 overall)
  9. isendr (1256 overall)
  10. preceden (1244 overall)
  11. docspal (1020 overall)
  12. anthologize (989 overall)
  13. udemy (977 overall)
  14. airdropper (847 overall)
  15. cloud-canvas (796 overall)
  16. vendr (745 overall)
  17. dragontape (713 overall)
  18. thinkup (673 overall)
  19. pusher (668 overall)
  20. google-buzz (653 overall)
  21. workflowy (601 overall)
  22. microsoft-fixit (578 overall)
  23. gpanion (577 overall)
  24. the-archivist (569 overall)
  25. about.me (555 overall)
  26. navflow (521 overall)
  27. quoterobot (503 overall)
  28. 48ers (495 overall)
  29. onlinedoctranslator (491 overall)
  30. boutiques (480 overall)
  31. clipconverter.cc (464 overall)
  32. urlvoid (460 overall)
  33. groupme (459 overall)
  34. kylo (456 overall)
  35. universalsubtitles (436 overall)
  36. dushare (429 overall)
  37. bgrepeat (424 overall)
  38. crowdmap (422 overall)
  39. yogile (409 overall)
  40. aviary-roc (409 overall)
  41. togetherville (407 overall)
  42. stackexchange-webapps (401 overall)
  43. vaultpress (400 overall)
  44. checkinmania (394 overall)
  45. face-api (388 overall)
  46. spiderpic (368 overall)
  47. proconlists (344 overall)
  48. coloreminder (334 overall)
  49. hootcourse (321 overall)
  50. transloadit (313 overall)
  51. check.in (311 overall)
  52. seevolution (303 overall)
  53. rootmusic (303 overall)
  54. formulists (300 overall)
  55. goodnoows (299 overall)
  56. peerindex (292 overall)
  57. grapholite (287 overall)
  58. nur.ph (278 overall)
  59. foodpair (273 overall)
  60. teamly (266 overall)
  61. pandaform (264 overall)
  62. gantto (262 overall)
  63. utubersidad (254 overall)
  64. twoolr (251 overall)
  65. drumbeat (240 overall)
  66. browserling (230 overall)
  67. google-storage (225 overall)
  68. copia (225 overall)
  69. licorize (218 overall)
  70. wrttn.me (212 overall)
  71. geotoko (211 overall)
  72. gofundme (206 overall)
  73. dermandar (206 overall)
  74. google-gaoptout (205 overall)
  75. glass (203 overall)
  76. curated.by (202 overall)
  77. docdroid (198 overall)
  78. plantly (193 overall)
  79. stackexchange-area51 (192 overall)
  80. tonecheck (189 overall)
  81. google-translateforanimals (179 overall)
  82. publisha (178 overall)
  83. chart.io (178 overall)
  84. threadbox (175 overall)
  85. cupidtino (175 overall)
  86. google-ad-innovations (170 overall)
  87. aol-lifestream (170 overall)
  88. txtbear (169 overall)
  89. schooloscope (167 overall)
  90. quotabl.es (167 overall)
  91. eatsmarter.de (166 overall)
  92. adobe-esignatures (164 overall)
  93. arcgis (163 overall)
  94. wolframalpha-widgets (161 overall)
  95. upstack (161 overall)
  96. lunchwalla (161 overall)
  97. historvius (161 overall)
  98. google-buzz-api (151 overall)
  99. findthebest (151 overall)
  100. sylights (146 overall)

See the Betas of the Year from 2005, 2006, 2008 and 2009.

See also the Class of 2004, 2005, 2006, 2007, 2008, 2009 and 2010.