Very often we would like to use a tool quickly, but are put off by a registration process.  Here you can find a neat list of tools indexed in 18 categories which do not require registration. Ready, set, explore!

QR Codes
Surveys and Polls
Online Whiteboards/Corkboards
PDF Tools
Charts
Word Clouds
Maps
Schedule
Reference (dictionary/thesaurus/concordance/corpus/citation)
Calculators/Converters
Documents (webpages/text/paste/view)
Annotation
Stories (create/read)
Chat/Conferencing
Presentation
Audio
Screencapture (image/video)
Video (view/edit/create)