My big list of all things EdTech - primarily FOSS apps.
Blogs
Hosted
Wordpress.com -
Blogger.com -
Edublogs -
TypePad -
Self-hosted
wordpress.org -
Wikis
Hosted
PBWorks -
Wikispaces -
Google Sites -
Wetpaint -
Wikidot -
Self-hosted
MediaWiki -
phpWiki -
TikiWiki -
Websites
Weebly -
Glogster -
Google Pages -
Feed Readers
Google Reader -
Bloglines -
Portal Software
Joomla -
Drupal -
Presentation Software
Slideshare -
Sliderocket -
Animoto -
Empressr -
Productivity Software
Google Docs -
OpenOffice -
Zoho -
Other
Voicethread -
EverNote -
Ediscio - Online Flashcards
Book Sharing
Shelfari -
Library Thing -
Social Boookmarking
Delicious -
Diigo -
Streaming/webcasting
Ustream -
Livestream - Formerly Mogulus
Filesharing
Box.net -
Dropbox -
Docstoc -
Scribd -
DropIO -
GIS Software
Google Earth -
Google Maps -
Photo Sharing
Flickr -
Picasa -
Snapfish -
Video Sharing
Youtube -
Teachertube -
Schooltube -
Viddler -
Professional Networking Sites
Twitter -
Plurk -
Linked In -
Facebook -
mySpace -
Ning -
E-Portfolio
Epsilen -
Visual CV -
Mahara -
E-Learning
Moodle -
LearnHub -
Communication
Skype -
Google Talk -
Audio Recording
Audacity -
TalkShoe -
Video Recording/Streaming
Windows Media Encoder -
Quicktime Streaming Broadcaster -
GabCast -
Virtual Environments
SecondLife -
MeetSee -
Video Conferencing
DimDim - Open-source videoconferencing application, can be run locally or hosted
Skype - One to one video only
Elluminate V-Room - Good for up to 3 concurrent users
Mindmapping
Webspiration -
Mindmeister -
Screencasting
Jing -
Drawing/Graphics
Google Sketchup -
GIMP -
Miscellaneous Helper Apps
http://www.assiniboine.net/user/staff/albertsc/software_essentials-2.htm
Visualization Tools
Wordle -
Programming/Animation
Scratch -