I build and share these tools:
File your workout routines and get a nice graphical overview of your personal achievements and improvements.
A virtual whiteboard to be shared by multiple persons at the same time. Users will be anonymous - so no one needs to sign in.
An iPhone App that allows you to calibrate the darkening effect of your photographic neutral density filters. Exposure Guide has a timer for single und combined filter use.
The external memory for innovation teams with special support for agile software development. We use this web application at Diebold Nixdorf to support our agile product development teams in China, Germany, Netherlands and Poland.