I run drawcharts[1], which is a tool to help you build good looking hand-drawn style charts. It is not very expensive so I am currently making around 500 a year from it.

Also, as someone who likes to go to conferences and meet and connect with people, I found it hard connecting to 50 people at a conference on Linkedin and then reaching back out to them. So I build LinkedMemo[2] which is a CRM on "top" of Linkedin. You scan a profile, the profile is automatically saved and enriched in the CRM with a quick note.

[1]: https://drawcharts.xyz [2]: https://linkedmemo.com