#self-hosted + #open-source

Upbound built Crossplane to help organizations build their platforms like the cloud vendors build theirs—with control planes. Crossplane is an open source, CNCF project built on the foundation of Kubernetes to orchestrate anything. Encapsulate policies, permissions, and other guardrails behind a custom API layer to enable consumers, whether human users, automated workflows, or AI agents, to self-service without needing to become an infrastructure expert.

Crossplane builds on the class leading Kubernetes control plane, extending its battle hardened reliability and security features like Role Based Access Control (RBAC) to orchestrate everything - not just containers. By extending Kubernetes’ control model beyond containers, Crossplane enables a unified control layer for infrastructure. Because it shares a foundation with Kubernetes, Crossplane also integrates smoothly with the broader cloud-native ecosystem, allowing platforms to build automation and higher-level tooling without reinventing infrastructure fundamentals.

Uptime Kuma is an easy-to-use self-hosted monitoring tool.

One server for your email, calendars, contacts and shared files, with spam and phishing protection built in. Every standard protocol your clients already speak (JMAP, IMAP, POP3, SMTP, CalDAV, CardDAV and WebDAV) supported natively.

Running mail used to mean stitching together half a dozen separate components (an MTA, a message store, a spam filter, a calendar server, a contacts server, a file server) each with its own configuration quirks. Stalwart collapses all of that into one platform: fewer services to deploy, one configuration to learn, one place to look when something needs attention, and a smaller attack surface.

OPEN SOURCE EMAIL INFRASTRUCTURE for enterprises and high-volume senders

Because KumoMTA is Open Source, we don’t charge for the software — this work is sustained entirely through sponsorships. When you become a sponsor you not only gain access to support and services, you also help power the continued innovation and progress of today’s most advanced email solution.

All prices are per billion messages per year, with no limits on number of servers.

Higher volume senders can contact us for custom pricing.

Self-hosted, semantically-connected personal knowledge base

A personal knowledge base that turns markdown notes into a semantically-connected, AI-augmented knowledge graph.

Atomic stores knowledge as atoms — markdown notes that are automatically chunked, embedded, tagged, and linked by semantic similarity. Your atoms can be synthesized into wiki articles, explored on a spatial canvas, and queried through an agentic chat interface.

FunctionGemma is a specialized version of our Gemma 3 270M model tuned for function calling. It is designed as a strong base for further training into custom, fast, private, local agents that translate natural language into executable API actions.