Cockpit is the Red Hat-led open-source Linux server web management console, letting you handle system monitoring, Podman container management, LVM storage management, and user configuration from a browser, free and open source, ideal for Linux server administrators and cloud server ops.
Kimai is an AGPLv3 open-source time tracking system from Germany supporting multi-project, multi-customer accounting and PDF invoice export, self-hostable for data sovereignty and a common choice for privacy- and cost-conscious teams.
Restya is an open-source kanban project management tool released in 2015, MIT-licensed on a PHP stack, supporting Docker self-hosted deployment and Trello-style card-based task management, with free data control and customization.
Trilium Notes was created in 2018 by Czech developer Adam P., an AGPLv3 open-source, self-hosted hierarchical note app. Unlimited hierarchical trees, relation maps, script extensions, and end-to-end encrypted sync suit personal knowledge management users with high privacy requirements.
Taskwarrior is an open-source command-line task management tool born around 2009, free under GPL, supporting priorities, projects, tags, and custom reports. Data is stored locally and pairs with Timewarrior for time tracking, ideal for terminal power users.
Super Productivity is an open-source (GPL) local-first task management and time tracking app with a built-in Pomodoro timer, time tracking, and Jira integration, storing data locally by default. It is free with no subscription.
Habitica is a gamified habit and to-do management platform from the United States with over 4 million users, turning habits, dailies and to-dos into an RPG leveling game that is free to use with an open-source core.
Foam is a free, open-source personal knowledge management tool built on VS Code, using local Markdown files and bidirectional links to build a knowledge graph, completely free under the MIT license, suited to technical users familiar with VS Code and Git.
Dendron is an open-source hierarchical note-taking tool built on VS Code, with local-first Markdown storage and 100+ commands for managing knowledge bases of tens of thousands of notes. Free and suited to developers and heavy knowledge users.
Bento is an open-source link-in-bio page builder founded in 2022 in San Francisco, a Linktree alternative that supports self-hosting, custom domains, and built-in analytics for building a personal brand page.
Anytype is a local-first, offline-capable open-source knowledge management platform featuring end-to-end encryption and an object-relationship model, currently free, ideal for privacy- and data-sovereignty-focused users.
phpList is an open-source mailing list and email marketing manager launched in 2000, self-hosted on PHP + MySQL with full data control and support for large subscriber lists.
Mautic is an open-source marketing automation platform launched in 2013, GPL-licensed and self-hostable, serving 200,000+ users with email marketing, lead scoring, and customer journeys.
Listmonk is a modern self-hosted mailing list manager launched in 2019, built with Go + Vue as a single deployable binary, API-first and lightweight with support for large subscriber lists.
Ghost is an open-source membership platform launched in 2013 with a built-in newsletter email system, free/paid subscriptions, and content paywalls, offering self-hosted and Ghost Pro hosting—an all-in-one way for creators to monetize subscriptions.
Founded 2011, Sensu is an open-source event-driven monitoring framework. Sensu Go is rewritten in Go with a Pipeline architecture for flexible event processing and alert routing. 300+ community plugins, 10,000+ events/sec per node throughput.
Riemann is a 2012-released open-source event stream processor built in Clojure for millisecond-level low-latency processing. It supports high-throughput event aggregation, filtering, transformation, and correlation with TCP/UDP multi-protocol ingestion for real-time monitoring event routing.
Munin is an open-source server resource monitoring tool from Norway with a Perl-based Master/Node architecture and RRDTool graphing engine. Its plug-and-play plugin mechanism keeps deployment simple for small server clusters.
LibreNMS is a PHP-based open-source auto-discovery network monitoring system that discovers network devices via SNMP, with 1,600+ device templates and a flexible alert rule engine.
Founded in 2009 and headquartered in Nuremberg, Germany, Icinga is an open-source enterprise monitoring system forked from Nagios. Icinga 2 rewrites the core engine in C++ with a modern web UI and native distributed architecture.
Founded in 2020, Highlight is an MIT-licensed open-source full-stack observability platform combining session replay, error tracking, log management, and performance monitoring. With 8,000+ GitHub Stars and self-hosted deployment, it is ideal for frontend and full-stack web teams.
Checkmk by Tribe29 (Germany) is an enterprise-grade IT monitoring platform launched in Munich in 2008 and evolved from Nagios. It offers agentless (SNMP/WMI) and agent-based monitoring with powerful auto-discovery and built-in visualization.
Founded in 2001, Cacti is an open-source RRDTool-based network traffic graphing tool that collects data via SNMP and generates visual charts, with template-based device management and 25 years of trend analysis.
YunoHost is a free and open-source self-hosting platform from France, built on Debian, offering one-click deployment of 400+ apps and built-in mail services from a single server with 2GB of RAM or more.