Jonas Jelten

jj's development fork of openage, a free (as in freedom) open source clone of the Age of Empires II engine.

Electronic Payment System for Festivals using NFC Wristbands

Payment splitting for groups

Efficient Ceph placement optimization, aiming for maximum storage capacity through equal OSD utilization.

nyan - yet another notation: typesafe hierarchical key-value database with inheritance and dynamic patching :smiley_cat:

A simple-stupid self-hostable continuous integration service.

All™ you ever wanted to know about operating a Ceph cluster!

Collection of storage device benchmarks to help decide what to use for your cluster

qemu kvm code injection, stealthy system call redirection inside a virtual machine

various config files for fast and efficient workflows on Linux

Pure-Python CephFS mount helper

Brain for the move-II cube satellite

Play submitted links with mpv on a videowall :movie_camera:

Versatile resource statistics tool

ZBar is an open source software suite for reading bar codes from various sources, including webcams. As its development stopped in 2012, I took the task of keeping it updated with the V4L2 API. This is the main repository for it. There's a clone at at LinuxTV.org, and another one at gitlab.

In application debugger for ARM Cortex microcontrollers.

cloud-init: cloud instance initialization

A community-driven Emacs distribution - The best editor is neither Emacs nor Vim, it's Emacs *and* Vim!

Deep blue and colorful emacs theme like a clear night sky

Software Development Kit for SFT projects

Theme pack used in Doom Emacs

Ceph is a distributed object, block, and file storage platform

totally simple file uploader in flask

Unprivileged sandboxing tool

qemu with x-tier support

OpenAPI client/server/docs generator

juju cloud orchestration engine

canonical's 2026 madrid hackathon project page

Idle management daemon for Wayland

Release notes and release schedules for Ubuntu Linux.

Linux namespaces and seccomp-bpf sandbox

Android Matrix messenger application using the Matrix Rust Sdk and Jetpack Compose

strace is a diagnostic, debugging and instructional userspace utility for Linux

Matrix Client-Server SDK for Rust

ubuntu patching for De novo assembly from Oxford Nanopore reads.

A general-purpose OpenStreetMap mapnik style, in CartoCSS

programmatic debian packaging with debian/rules.py

Python framework for writing Juju charms

Charm for deploying Ubuntu's debuginfod service to provide distro package debugging information

Powerful system container and virtual machine manager

Monorepo for Canonical charmlibs.

iPXE network bootloader

sophisticated command line file transfer program (ftp, http, sftp, fish, torrent)

Python interfaces for instantiating and executing builds for a variety of target environments.

Cross-platform Rust rewrite of the GNU coreutils

Ubuntu Pro Client for offerings from Canonical

Documentation for Ubuntu Server: https://documentation.ubuntu.com/server/

Project documentation about the development, releasing, and maintenance of the Ubuntu Linux distribution.

Ubuntu Maintainer's Handbook

Chatbot for the Matrix Protocol, supporting encryption and plugins.

Python Matrix client library

An implementation of the Debug Adapter Protocol for Python

Debug Adapter Protocol for Emacs

Emacs Python Code navigation, documentation lookup and completion

jj's contributions to Doom Emacs

Linter plugin for pylsp based on ruff.

Automatic keyboard repeat rate configuration for new keyboards

Self-hosted dyndns/dynamic DNS server and updater for bind

ansible it automation platform

The open source Cloud & Edge Computing Platform bringing real freedom to your Enterprise Cloud 🚀

Powerline theme from Spacemacs

Low-level IO utilities for PosgtreSQL drivers.

The systemd System and Service Manager

jj's fork of the Gentoo ebuild repository

Syntax based indentation for SQL files inside GNU Emacs

Mako Templates for Python

Recipes and build machinery for the biggest Emacs package repo

Boot your normal system on a different hardware device via network

Example from first chapter of 'Refactoring' by Martin Fowler, with tests and translations

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yea sure this is secret

Complete open source web conferencing system.

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a versatile software implementation that runs on any commodity hardware. From a Raspberry PI to a multi-core server, FreeSWITCH can unlock the telecommunications potential of any device.

Scalable load balancer for BigBlueButton.

hackerspace lock

simple periodic backup tool based on borgbackup and snapper

Postgres CLI with autocompletion and syntax highlighting

Software to automate the management and configuration of any infrastructure or application at scale. Get access to the Salt software package repository here:

A glossy Matrix collaboration client for the web.

Matrix SDK for React Javascript

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Development blog for openage

Synapse: Matrix reference homeserver

An LDAP3 auth provider for Synapse

openage content creation guidelines

Free (as in freedom) media files for openage.

simple stupid satellite transport protocol

Lobby and matchmaking server for openage in Haskell

Test project for interacting with Github's CI webhooks/API stuff.

JJ's Linux kernel source tree