Web 2.0 Collaboration Services (125 sites)

Services allowing multiple users to group and collaborate/share including blogging, bookmarking, tasks, to-do etc

1. 30boxes : online calendar (#,a-b)
2. 43 Things : social goal setting (#,a-b)
3. AirSet : calendars, contacts, lists, blogs, weblinks sharing (#,a-b)
4. ajchat : ajax based chat room (#,a-b)
5. Ambedo : tag search engines (#,a-b)
6. askeet : collaborative question and answering (#,a-b)
7. Asoboo : social networking with events/places (japanese) (#,a-b)
8. AssociatedContent : info / content hosting / sharing (#,a-b)
9. BareWiki : wiki for collaborative notes (#,a-b)
10. Basecamp : project management tool (#,a-b)
11. BiddingBuddies : social networking for ebay members (#,a-b)
12. Billmonk : social financial responsibilities (#,a-b)
13. BlinkList : social bookmarking (#,a-b)
14. Blogmarks : social bookmarking (#,a-b)
15. BuddyMarks : social bookmarking (#,a-b)
16. CalendarHub : online calendar (c-d)
17. Campfire : business group chatting (c-d)
18. CentralDesktop : instant workspaces for teams and workgroups (c-d)
19. Chalksite : classroom management (c-d)
20. Clipmarks : web clipping sharing (c-d)
21. cluebacca : social text clips sharing (c-d)
22. CollaborativeRank : delicious search engine (c-d)
23. Collective X : group calendar, discussions, email, sharing (c-d)
24. CommonTimes : social bookmarking for news (c-d)
25. Conversate : instant online discussion spaces (c-d)
26. Dailymotion : video sharing (c-d)
27. del.icio.us : social bookmarking (c-d)
28. Diigo : social bookmarking with annotation (c-d)
29. dodgeball : social networking with mobile phones (c-d)
30. Dogear : bookmarking tool (c-d)
31. Douban : books/music/movies review share (c-d)
32. eSnips : online content sharing (e-f)
33. eTribes : text messenger service (e-f)
34. eventful : social calendar sharing (e-f)
35. Eventicus : social events manager; german (e-f)
36. EventSniper : online calendar (e-f)
37. evnt : social calendar sharing (e-f)
38. Facebook : social student networking (e-f)
39. Favorville : social networking doing favors (e-f)
40. Foopad : hosted wiki service; free (e-f)
41. Frappr : personal/group map sharing (e-f)
42. Friendster : social networking (e-f)
43. Fundable : social fundraising (e-f)
44. Furl : social bookmarking (e-f)
45. Gliffy : draw and share diagrams on the web (g-h)
46. Grou.ps : sharing platform for groups (g-h)
47. Hanzo : social bookmarking and archiving (g-h)
48. HipCal : online calendar, todo list (g-h)
49. Hula : open source calendar and mail server (g-h)
50. iKarma : social business networking with recommendations (i-j)
51. iRows : web-based spreadsheet (i-j)
52. Jambo : social networking (i-j)
53. Jeteye : social info sharing (i-j)
54. Jots : social bookmarking (i-j)
55. JotSpot : live group note-taking (i-j)
56. Joyent : web-based software (email, calendars, contacts, shared apps) (i-j)
57. Kaboodle : social info sharing (k-l)
58. Kiko : online calendar (k-l)
59. Kolablog : multimedia blogging service; free (k-l)
60. KopiKol : social bookmarking (k-l)
61. linkedin : social business networking (k-l)
62. LiveMarks : live del.icio.us additions (k-l)
63. LookLater : private bookmarking and archiving (k-l)
64. Lovento : social networking and meeting (k-l)
65. ma.gnolia : social bookmarking service (m-n)
66. Map Mix : mapped social networking (m-n)
67. MeetWithApproval : group meeting manager (m-n)
68. MyLinkVault : social bookmarking (m-n)
69. MySpace : social networking (m-n)
70. Mystickies : add sticky informational notes on web pages (m-n)
71. MyWebDesktop : personal and collaborative web-based desktop (m-n)
72. Near-Time : group collaboration space; hosted; free and paid (m-n)
73. NewHots : chinese portal for rss, bookmarks (m-n)
74. Nextaris : social bookmarking, networking, blogging (m-n)
75. Numbler : web-based spreadsheet (m-n)
76. NumSum : online shareable spreadsheet (m-n)
77. opinity : social networking with testimonials (o-p)
78. Orkut : social networking (o-p)
79. PBWiki : online document hosting and sharing (o-p)
80. PeerProfile : social info / bookmark / photo sharing (o-p)
81. Pixel Group : collaborative pixel drawing (o-p)
82. Planzo : online calendar sharing (o-p)
83. ProjectSpaces : online team collaboration (o-p)
84. Qwik : hosted wiki service; free (german) (q-r)
85. Rallypoint : online collaboration service (q-r)
86. RawSugar : online bookmarking (q-r)
87. Schtuff : online document hosting and sharing (s-t)
88. Segnalo : social bookmarking (italian) (s-t)
89. ServerSideWiki : micro-site hosted wiki (s-t)
90. Shadows : social bookmarking (s-t)
91. Simpy : social bookmarking (s-t)
92. Skobee : social events manager (s-t)
93. Spongecell : online calendar (s-t)
94. Spurl : social bookmarking (s-t)
95. StikiPad : online document hosting and sharing (s-t)
96. StumbleUpon : social bookmarking / web discovery tool (s-t)
97. SynchroEdit : collaborative document edit (s-t)
98. TagFacts : online tagged notes (s-t)
99. Taggle : social bookmarking (german) (s-t)
100. Tagsy : social bookmarking and feed management; coming soon! (s-t)
101. TagTooga : user submitted directory (s-t)
102. TagWorld : social networking + blog + music + storage (s-t)
103. TasksPro : online todo lists; free and paid (s-t)
104. Tilika : online calendar (s-t)
105. Trumba : online calendar sharing (s-t)
106. Upcoming : social events calendar (u-v)
107. Vyew : browser-only web meeting (u-v)
108. Wayfaring : social map sharing (w-x)
109. Web Collaborator : online collaboration service (w-x)
110. Web2-0.de : online document hosting and sharing (german) (w-x)
111. WebBrush : online collaborative notes/charts/diagrams (w-x)
112. wideword : online rich document sharing (w-x)
113. Wikipedia : online encyclopedia / info sharing (w-x)
114. Wikispaces : online wiki space (w-x)
115. Wists : social bookmarking; shopping (w-x)
116. Writeboard : collaborative writing (w-x)
117. Writely : collaborative writing (w-x)
118. Xanco : free mobile weblog; photos, videos, groups (w-x)
119. yackpack : email for voice (y-z)
120. Yahoo! My Web 2.0 : social bookmarking (y-z)
121. Yoono : social bookmarking software (y-z)
122. Zingee : social file sharing service (y-z)
123. Zoho Chat : group chatting service (y-z)
124. Zoho Writer : online document hosting and sharing (y-z)
125. Zvents : social events sharing (y-z)