documents to go

Text editor allows combining documents as a workbook.

Organize, create, and share documents.

Indexing/retrieval system for text and documents.

Overlay text and graphics on PDF documents. Great for filling out forms.

Convert Word documents into PDF format.

Convert documents between Microsoft Office and AppleWorks format.

Plugin makes Mellel documents searchable.

Create timelines for print, web, documents, presentations, and more.

Allows you to attach Stickies-style notes to documents.

Check XML and XHTML documents in TextMate (was TeXMLMate).