1. Group communication
1.1. Yammer
1.2. Socialcast
1.3. Friendfeed
1.4. Campfire
1.5. Tgethr
1.6. Hashwork
1.7. Jaiku
1.8. Present.ly
1.9. Sharetronix
1.10. Socialwork
1.11. Status.net
1.12. Tibbr
2. for more info about Online Collaboration Tools see Robin Good's MasterNewMedia
3. Project Management
3.1. Basecamp
3.2. GroupMindExpress
3.3. 5pm
3.4. ActiveCollab
3.5. Staction
3.6. Daptiv
3.7. Task2Gather
3.8. Planyp.us
3.9. CoMindWork
3.10. Colabolo
3.11. eLoops
3.12. ClockingIT
3.13. Klok
3.14. PieMatrix
3.15. Teambox
3.16. Smartsheet
3.17. TaskPoint
3.18. ProjectManager
3.19. ProjectPlace
3.20. CollaborateCloud
3.21. ProofHub
3.22. TeamWork-Live
3.23. Wedoist
3.24. Teamwork-PM
3.25. Snipia
3.26. ProjectManager
3.27. Planio
3.28. BetterMeans
3.29. Teambox
3.30. activeCollab
3.31. Planio
4. Chat
4.1. Userplane
4.2. Tinychat
4.3. CampFire
4.4. Meebo
4.5. Zoho Chat
4.6. Chatterous
4.7. Google Wave
4.8. Donutchat
4.9. ISL Pronto
4.10. 99Chats
4.11. Nurph
4.12. Hipchat
4.13. NeatChat
4.14. Stinto
4.15. Chatzi
4.16. Wireclub
4.17. BabelwithMe
4.18. DonutChat
4.19. GixawChat
4.20. TodaysMeet
4.21. Dropio Chat
4.22. Backnoise
4.23. Talker
5. VoIP - Audio Conferencing
5.1. Skype
5.2. ooVoo
5.3. Voxox
5.4. JahJah
5.5. REBTEL
5.6. GTalk
5.7. Vyke
5.8. Gizmo5
5.9. Voxli
5.10. Voxopop
5.11. Powwownow
6. Large Audience Webinars - 100+ participants
6.1. Gatherplace
6.2. Adobe Connect Pro
6.3. GoToWebinar
6.4. iVocalize.com
6.5. HotConference.com
6.6. Wiziq
6.7. TokBox Broadcast Video Chat
6.8. DimDim Enterprise
6.9. WebEx Event Center
6.10. Freebinar
6.11. Clickwebinar
6.12. FuzeMeeting Pro
6.13. GoMeetNow
6.14. Vokle
7. Video Conferencing
7.1. Video-Chat
7.1.1. Gchat
7.1.2. Rounds
7.2. VuRoom
7.3. TokBox
7.4. Oovoo
7.5. Sightspeed
7.6. VSee
7.7. Mebeam
7.8. Flashmeeting
7.9. EyeJot
7.10. DoVisio
7.11. APideo
7.12. XyKast
7.13. Palbee
7.14. Scopia Desktop
7.15. Meeting24
7.16. Persony
7.17. InstantPresenter
7.18. Tinychat
7.19. HP SkyRoom
7.20. Wetoku
7.21. VisionKontakt
7.22. ViVu
7.23. Zorap
7.24. Mirial ClearSea
7.25. TokBox Broadcast Video Chat
7.26. eMeetPlus
7.27. Glide
7.28. Thinsy
7.29. Ekiga
7.30. VuRoom
7.31. Chatride
7.32. Meeting24
7.33. Goober
7.34. Skype
7.35. AttendAnywhere
7.36. iWowWe
7.37. ViVicom-ViFree
7.38. LiveCage
7.39. Nefsis
7.40. VideoPort
7.41. Auralink
7.42. Faceflow
7.43. Q-Next
7.44. Sifonr
8. Instant Messaging
8.1. Skype
8.2. AOL IM
8.3. Meebo
8.4. eBuddy
8.5. Yahoo Messenger
8.6. Google chat and video
8.7. ICQ
8.8. Windows Live Messenger
8.9. Jabber
8.10. BigAnt
8.11. Q-Next
8.11.1. Software PC, Mac, Linux
9. Screen-Sharing
9.1. GoToMeeting
9.2. eBLVD
9.3. ConnectNow
9.4. Microsoft Shared View
9.5. Yuuguu
9.6. WebExNow
9.7. LiveLook
9.8. Vyew
9.9. Crossloop
9.10. Glance
9.11. Yugma
9.12. Teamviewer
9.13. BeamYourScreen
9.14. Remote Control
9.14.1. GoToAssist
9.14.2. RealVNC
9.14.3. GoToMyPC
9.14.4. logmein
9.14.5. Teamviewer
9.14.6. TightVNC
9.14.7. LiveLook CoBrowsing
9.14.8. Proxy Pro6
9.14.9. Skyfex
9.14.10. Techinline
9.14.11. ScreenConnect
9.14.12. IminTouch
9.14.13. ISL Light
9.14.14. SupportSmith
9.14.15. ScreenConnect
9.14.15.1. PC software
9.14.16. Banckle
9.15. Acrobat.com
9.16. Netviewer
9.17. Mikogo
9.18. Gogrok
9.19. PocketMeeting
9.20. Oneeko (Skype plugin)
9.21. Present.io
9.22. ShowDocument
9.23. Dynno
9.24. GoGrok
9.25. SaviiDesk
9.26. Join.me
10. Collaborative Visual Reviewing
10.1. Backboard
10.2. Creately
10.3. A.nnotate
10.4. Diigo
10.5. uptogo
10.6. ReviewBasics
10.7. ConceptShare
10.8. Octopz
10.9. Textflow
10.10. inMotionNow.com
10.11. Cozimo
10.12. Workflow & Review
10.13. Friendpaste
10.14. ProofHQ
10.15. Colaab
10.16. Revizr
10.17. FuzeMeeting
10.18. Huddle.net
10.19. Oryx Editor - BPMN Community
10.20. Notable
10.21. The Commentor
10.22. Mocksup
10.23. ConceptFeedback
10.24. Pidoco
10.25. Bounce
10.26. Draftboardapp
11. Web Conferencing
11.1. WebEx
11.2. Elluminate
11.3. Wimba Classroom
11.4. DigitalSamba (free for 3)
11.5. Centra
11.6. Elluminate VRoom (free for 3)
11.7. Adobe Connect Now (free for 3)
11.8. WebTrain (free for 2)
11.9. iVocalize
11.10. DimDim (free for up to 20 people)
11.11. Spreed
11.12. WebHuddle
11.13. Convenos
11.14. Zoho Meeting
11.15. Acrobat.com
11.16. OpenHuddle
11.17. Microsoft Live Meeting
11.18. iLinc
11.19. Netspoke
11.20. Genesys
11.21. Omnovia
11.22. ReadyTalk
11.23. e-Lecta
11.24. Hypermeeting
11.25. Live Conference PRO.com
11.26. Expressway Flexchat
11.27. WebConference.com
11.28. DoConference
11.29. Nefsis
11.30. OpenMeetings
11.31. vMukti MeetingPlace
11.32. OpenConference
11.33. Wiggio
11.34. VeriShow
11.35. ISL Groop
11.36. Kablink Conferencing
11.37. BigBlueButton
11.37.1. open-source
11.37.2. Mac, PC, Unix
11.38. IBM Lotus LiveEngage
11.39. Sococo
11.40. OpenMeetings
11.41. TeamApart
11.42. FlashMeeting
11.43. Visionkontact
11.44. InnerPass
11.44.1. works with Skype
11.45. ImInTouch-Meeting
11.46. Formeeting
11.47. Sococo
11.48. GVOConference
11.48.1. spammy MLM
11.49. Wiggio
11.50. Clickmeeting
11.51. Banckle
11.52. GoMeetNow
11.53. Digitell
11.54. BigMarker
11.55. AffordableWebMeetings
11.56. NetConference
11.57. Apptix
12. Document Sharing - Wikis
12.1. Comindwork
12.2. pbwiki
12.3. WetPaint
12.4. wikidot
12.5. mediawiki
12.6. wikispaces.com
12.6.1. for teachers
12.7. GoogleDocs
12.8. GoogleSites
12.9. Socialtext
12.10. Zoho
12.11. mindtouch Deki
12.12. etherpad
12.13. Couchit
12.14. SocialText
12.15. Database Publishing
12.15.1. blist
12.15.2. Tablefy
12.15.3. Listphile
12.15.4. Dabble DB
12.16. Document Publishing
12.16.1. Scribd
12.16.2. Issuu
12.16.3. Scribd
12.16.4. Docstoc
12.16.5. Acrobat.com
12.16.6. TXTBear
12.17. source control
12.17.1. Subversion/Tortoise
12.18. KnowledgePlaza.be
12.19. Mixedink
12.20. Microsoft SharePoint
12.21. PBWiki
12.22. Microsoft Docs
12.23. Wepapers
13. Co-browsing
13.1. Clavardon
13.2. Holoday
13.3. PageShare
13.4. Showdocument
13.5. Wizlite - Page highlighting
13.5.1. asynchronous
13.6. Twiddla
14. Web Presenting
14.1. Slideshare
14.2. SlideRocket
14.3. woices.com
14.4. PresenterNet.com
14.5. InstantPresenter
14.6. Vcasmo
14.7. 280 Slides
14.8. Livemeetups
14.9. Freepath
14.10. Mightymeeting
14.11. ZohoShow
14.12. Multimedia Presentations
14.12.1. Vuvox
14.12.2. Animoto
14.12.3. OneTrueMedia
14.12.4. Scrapblog
14.12.5. bubbleshare
14.12.6. Voice Thread
14.12.7. Zentation
14.12.8. Present.io
14.13. Kineticast
14.14. MyPlick
14.15. Live Present
14.16. SlidePresenter
14.17. Slide-Casts
14.18. My-Slide-Presenter
15. WorkGrouping / Team Collaboration Workspaces
15.1. Zenbe
15.2. WizeHive
15.3. BantamLive
15.4. Broadchoice Workspace
15.4.1. dead
15.5. WebOffice
15.6. BarCamps
15.7. Edmodo.com
15.7.1. Microblogging for Education
15.8. Affinitiz.com
15.8.1. Rooms for teams + external blog
15.9. Colaab
15.10. Sosius
15.11. Deskaway
15.12. Collaber
15.13. Campfire
15.14. CentralDesktop
15.15. GroupmindExpress
15.16. Ovosuite
15.17. Clearspace
15.18. Sosius
15.19. MyNetResearch
15.20. OneDrum
15.21. Onehub
15.22. Huddle.net
15.23. Ubidesk
15.24. HyperOffice
15.25. WizeHive
15.26. TeamApart
15.27. Ubidesk
15.28. Wiggio
15.29. FMYI
15.30. Collaboroo
15.31. GlassCubes
15.32. Kablink Teaming
15.33. Incipi
15.34. Threadbox
15.35. Engage
15.36. Zcope
15.37. Sambajam
15.38. CompanyConcert
15.39. CubeTree
15.40. Obayoo
15.41. Qontext
15.42. ContactOffice
15.43. Teambox
15.44. Humanedj
16. Event Scheduling
16.1. eventbrite
16.2. Schedgit
16.3. GCalendar
16.4. Timebridge
16.5. any iCal app
16.6. Chandler
16.7. Amiando
16.8. Doodle.com
16.9. Genbook
16.10. AgreeAdate
16.11. MeetWithApproval
16.12. Cvent
16.13. Tungle
16.14. Shiftboard
16.15. ScheduleOnce
16.16. Zeeyoo
16.17. Appointment-Plus
16.18. Skedgememe
17. File Sharing
17.1. Microsoft Live Mesh
17.2. Filedropper.com
17.3. Filemail.com
17.4. youSendIt
17.5. drop.io
17.6. transferbigfiles.com
17.7. box.net
17.8. Dropbox
17.9. senduit
17.10. 4shared.com
17.11. Virtual desktops
17.11.1. Jooce
17.12. Clip2Net
17.13. Spider Oak
17.14. Gigashift
17.15. Filephile
17.16. KnowledgePlaza.be
17.17. Esnips.com
17.18. Rapid Share
17.19. Wuala
17.20. iFolder
17.21. CloudApp
18. Whiteboarding
18.1. Dabbleboard
18.2. Skrbl
18.3. Vyew
18.4. Ge Inspiration Cubed
18.5. Depicto
18.6. Twiddla
18.7. Scriblink
18.8. Groupboard
18.9. Scribblar
18.10. ShowDocument
18.11. Flowchart
18.12. Virtual whiteboard
18.13. Google Drawings
18.14. Skrbl
18.15. Co-Sketch
19. MindMapping & Diagramming
19.1. Creately
19.2. MindMeister
19.3. Bubbl.us
19.4. Mind42
19.5. Mywebspiration
19.6. Spinscape
19.7. Gliffy
19.8. LucidCharts
19.9. Xmind
19.10. SpicyNodes
19.11. Creately
19.12. MindJet Catalyst
19.13. Comapping
19.14. Cacoo
19.15. ThinkFold
19.16. Mindomo
19.17. Ideatree
19.18. Edistorm
19.19. Slatebox
19.20. CoSketch
20. Collaborative Writing
20.1. Buzzword
20.2. Zoho Writer
20.3. Writeboard
20.4. Google Docs
20.5. Quicktopic
20.6. SynchroEdit
20.7. Gobby
20.8. Etherpad
20.9. TextFlow
20.10. WriteWith
20.11. ThinkFold
20.12. Springloops
20.12.1. for coders