Spinmusic

Take back control over your music - Spinmusic is a music player that plays your local music library through the browser. Edit metadata, manage cover art and write lyrics and time them directly from the player.

JLPT-Info

Will you pass the JLPT? On JLPT-Info you can calculate your chances. The project helps learners of Japanese plan their path through the Japanese-Language Proficiency Test. It features an interactive study hours calculator, level comparisons, pass rate statistics, and a planning tool to estimate your time to the next level.

Logrio

As your language learning skills advance, writing a little every day is one of the most effective ways to consolidate grammar, expand vocabulary, and gain fluency. Logrio is a lightweight tool I built that helps language learners build a consistent daily writing habit.

Teamhub club management

I am the founder of Teamhub a Germany based club management software (Vereinsverwaltungssoftware) with focus on data privacy. Teamhub is used by clubs like Letzte Hilfe, Advance Care Planning international and the Schweizerische Gesellschaft für Biomedizinische Ethik in Germany, Switzerland, Austria and around the world.

Web app: Learn the 20 proteinogenic amino acids

This open source web application aims to help university students learn the 20 proteinogenic amino acids. The original idea was developed at the university in 2007 and is continually improved upon. Have a look at the source code at GitHub.

Language Learning Plattform Gengo

I am co-founder of the Language Learning Plattform Gengo, providing German students of the Japanese language an interactive platform to improve their language skills in conjunction with the book Japanisch im Sauseschritt (the German version of Japanese for Busy People).
We also provide a smartphone app aimed at learning the Japanese alphabet.