I maintain a hands-on approach to software development and make much of my work available under open-source licenses, so here is my list of recent open source apps
Open Source Apps (Web, iOS, Android)
Tracks changes in diesel, E10, and E5 fuel prices across Germany.
Web App: https://tankzeit.de/
iOS: https://apps.apple.com/de/app/tankzeit/id6759522835
Android: https://play.google.com/store/apps/details?id=de.tankzeit.android
Source: https://github.com/volzinnovation/tankzeit.de
Find reliable charging stations in Europe with the best nearby amenities.
Web App: https://woladen.de/
Source: https://github.com/volzinnovation/woladen.de
iOS: https://apps.apple.com/de/app/wo-laden/id6759499459
Android: https://play.google.com/store/apps/details?id=de.woladen.android
Intelligent Speed Assistance based on OpenStreetMap.
Website: https://youspeed.de/
iOS / Android / Source: Available after launch at SOTM end of August 2026
An interactive browser for exploring German weather data ( based on DWD HYRAS-DE climate data) from 1951 onward.
Website: https://klima1951.de/
Source: https://github.com/volzinnovation/klima1951.de
A election-tracking and publishing system for German elections, including archived interim results.
Website: https://wahl-monitor.de/