What tools do the editors of DiRT consider to be essential?

Lisa Spiro, Director, Digital Media Center, Rice University:

All of my favorite tools are free:

• Diigo: easily tag, annotate and share web resources
• Google Docs: author collaborative documents
• IrfanView: free image editor and viewer for Windows; great batch processing features
• Remember the Milk: create and organize to-do lists
• TAPOR: web-based text analysis and visualization tools
• WordPress: blogging platform that makes it easy to write blog posts, track user stats, and more
• Zotero: automatically capture bibliographic information and produce bibliographies; organize, search and analayze research collections; take notes.

Carlos Galan-Diaz, researcher/PhD student, The Robert Gordon University:

can't live without the following, they are all free too :D

• delicious
• dropio
• fastladder
• TagCrowd 
• Twine 
• Zooomr