Beginning of the 1990th I did develop and publish (through partner) under the label "Raindorf Soft" together with Harald Schönfeld a couple of programs for the ATARI ST computer line:
There are still traces of these programs in the internet:
Test RouteIt and CircuIt (ST Magazin 1992)
Test WinRec and WinCut (ST Magazin 1994)
1998 - 2002
Not really a "project" but my time as an employee at the start-up VM Labs in Silicon Valley (California, USA).
Visual - Control and visualize your SmartHome!
Small iOS App to manage leased cars (km-Leasing)
2009 - 2017
SmartHome App for the iPhone of the first hour. Later also as iPad and Apple Watch App. CasaRemote was retired in late 2017 ... More details on the history of CasaRemote can be found here.
For some time I planned to make some of my code snippet from many years of hobby programming available as Open Source to the public. 2019 I finally did it. A start is made...
EMIL - Tiny scripting language embeddable in any Swift project
TinyJSONPath - Tiny JSONPath like implementation in Swift