Office

Diagramming

• Dia Portable - full-featured diagramming tool

Document Viewers

• Sumatra PDF Portable - a lightweight PDF viewer

Calculators

• SpeedCrunch Portable - an intuitive algebraic calculator

Financial

• GnuCash Portable - accounting, expenses and financial management

Office Suites

• OpenOffice.org Portable - word processor, spreadsheet, presentations with Microsoft compatibility

Organization

• Lightning Extension (for Thunderbird) - A lightweight extension for your calendar and tasks
• Mozilla Sunbird, Portable Edition - Calendar and task management with a familiar interface
• Task Coach Portable - to do list and task manager
• Mozilla Thunderbird, Portable Edition (Address Book) - Simple address book with import/export

Other

• PDFTK Builder Portable - split, collate, watermark and password protect PDF documents
• PNotes Portable - stick notes to go

Presentations

• OpenOffice.org Portable Impress - a solid presentation tool is built into this office suite

Spreadsheets

• OpenOffice.org Portable Calc - a complete spreadsheet is built into this office suite

Word Processors

• AbiWord Portable - a lightweight word processor compatible with Microsoft Word files
• OpenOffice.org Portable Writer - a full-featured word processor is built into this office suite