I once needed a database of EV charging locations, but at the time(2011) there were no open databases, so I built https://openchargemap.org, that now serves millions of API queries per month for other apps and services
For another project, I recently wanted to control my guitar amp (a Positive Grid Spark) from my computer instead of using a mobile app, so I built https://soundshed.com which is both a bluetooth web app and an electron app you can install. It now has a few thousand users :)
And finally, another time I had some SSL certificates I needed to manage for another project (for the above mentioned https://openchargemap.org), so I built a GUI to manage and renew certificates on Windows. It's now a commercial app with hundreds of thousands of users and it's my full time job: https://certifytheweb.com
I once needed a database of EV charging locations, but at the time(2011) there were no open databases, so I built https://openchargemap.org, that now serves millions of API queries per month for other apps and services
For another project, I recently wanted to control my guitar amp (a Positive Grid Spark) from my computer instead of using a mobile app, so I built https://soundshed.com which is both a bluetooth web app and an electron app you can install. It now has a few thousand users :)
And finally, another time I had some SSL certificates I needed to manage for another project (for the above mentioned https://openchargemap.org), so I built a GUI to manage and renew certificates on Windows. It's now a commercial app with hundreds of thousands of users and it's my full time job: https://certifytheweb.com
So yeah, worth doing!