- wireless VGA adapter - one part plugs into a VGA port of your laptop, other into the display, and you can work on a second screen (or a projector) while sitting with a laptop on a couch, and you don't have to care about the display cable.
- multi-way TODO sync - a set of open-source converters of TODO lists and associated service. Open source mostly so that one person don't have to write them all, and could instead crowdsource the project. Converters would most likely have to utilize an intermediate format, e.g. one module would convert from Due Today to the common format, and another from common format to, say, Emacs .org files. Motivation: this way I could use Org Mode on my computer, Due Today on my phone, Outlook at work, etc. etd.
- marketing company based on Eliezer's ideas from here: https://news.ycombinator.com/item?id=5625966
- getworkdonemusic.com optimized for Pomodoro technique
- The Sims-like online editor for virtual characters, which you can then order 3D printed and shipped to you the next day