A browser-based planetarium that can be customised and embedded in web pages.

A command-line tool for producing vector-graphics charts of the night sky in SVG, PDF and PNG formats.

Low-cost digital setting circles for Dobsonian. Ported to original code PlatformIO. Added my modifications for a Meade Lightbridge 10" scope.

Create an UDP-over-UDP reverse tunnel to make a VPN server behind (CG-)NAT accessible from the outside

Tesseract Open Source OCR Engine (main repository)

A Simple but Powerful Flat File Database Storage.

SQLite JDBC Driver

Web/javascript apps

Compiles Java bytecode to JavaScript, WebAssembly and C

A Java to JavaScript transpiler.

A simple and modern Java and Kotlin web framework

Java Statistical Analysis Tool, a Java library for Machine Learning

For ESP8266 and ESP32 edit configuration with web page and save it on SPIFFS. If no connection to a local WLAN exists configuration over web page can be done using an access point

Simple C++ library allowing to compute planet coordinates (equatorial and horizontal) with an Arduino Mega.