Google Docs & Spreadsheets Just like it soundsbasic word processor and spreadsheets.
ThinkFree Microsoft-compatible word processing (Write), spreadsheets (Calc), and presentations (Show).
Zoho Microsoft-compatible word processing (Zoho Writer), spreadsheets (Zoho Sheet), presentations (Zoho Show), e-mail and calendar groupware (Zoho Virtual Office), bare-bones database (Zoho Creator), project management (Zoho Projects), and organizer (Zoho planner).
Ajax13 Word processor (ajaxWrite), graphic editor (ajaxSketch), spreadsheet app (ajaxXLS), and presentations app (ajaxPresents) that work in Firefox only.
gOFFICE Not quite free ($.99/month) word processing, desktop publishing, presentations, and spreadsheets with minimal features, no online storage, and pdf-only output.
iNetOffice Microsoft-compatible word processor.
Gliffy Diagram/document creator.
Num Sum Spreadsheet app.
Thumbstacks Presentations app.