Everything is connected – that's nature. We severed those connections. Now we're reconnecting.
Hi, I'm Fred.
I'm a human who creates connections – with ease and joy.
Software architect from Munich. I build open, federated infrastructure – so even small initiatives become visible.
The Problem
You ask your AI assistant: "Where can I get my broken toaster fixed in Munich?" It recommends buying new on Amazon. Not because repair cafés don't exist – but because they're invisible to machines.
“If you don't exist in structured data, you don't exist for AI.”
Small initiatives – repair cafés, community-supported agriculture, community gardens, local organic shops – are invisible on the internet. Not to people, but to machines. And machines decide what gets found today. This is getting worse, not better.
What I'm building against it
Open infrastructure that makes local initiatives visible – for people and for AI. Not a platform that controls data – but open rails for others to ride on.
Imagine this:
Your AI assistant queries other AI assistants connected to local initiatives via the internet. One responds: "The repair café on Schleißheimer Straße is open next Saturday and fixes small electronics." This information doesn't come from Google. It comes directly from the initiative itself – open, current, no middleman.
For whom?
Local Initiatives
Repair cafés, CSAs, food co-ops – visible in the Fediverse and to AI systems
Common Good Networks
Connecting members via open standards instead of closed platforms
AI Developers
Open, federated knowledge graphs as data sources (GraphRAG)
How It Works
Two brands, one federated foundation.
The Technology
ChangingGraph
Prototype running
A software platform that stores and shares knowledge about initiatives, products, and services as linked data. Not a central database owned by a company – a federated system: every initiative can run its own instance, and all instances can talk to each other. Like email, but for knowledge.
The Community
gsund.rocks
Active
The non-technical side. For people interested in a fair, transparent economy. Values: sustainability, transparency, fairness, self-determination. The door for everyone who wants to participate without being a programmer.
The Foundation: Fediverse & ActivityPub
The technical core: ActivityPub + SKOS + RDF = the Fediverse for knowledge. Each Bounded Context in ChangingGraph becomes a standalone Actor that communicates with the world via ActivityPub.
More Building Blocks
Open Food Graph
What's in my food? Where does it come from? Three major data sources – German Federal Food Database (BLS), Open Food Facts (4M products), FoodOn (96,000 classifications) – don't talk to each other. ChangingGraph makes them accessible as Linked Data, with taxonomy mapping between systems.
VisionZemma Wissa
Google has 54 billion facts in its Knowledge Graph. Zemma Wissa (Swabian: "knowing together") is the counterpoint: a knowledge network that belongs to no one. Governance following Elinor Ostrom's commons principles. Decentralized, like Mastodon as an alternative to Twitter.
Vision – concept paper completedskos-fed
The centerpiece: a method for AI agents to exchange knowledge with each other. Federated, open, without central control. Built on ActivityPub and SKOS (W3C standard). This is what makes the toaster scenario technically possible.
In progress – PoC is the next goalWhat's underneath
Protocol Layer
ChangingGraph FEPs (7 drafts), SKOS-Fed, ActivityPub S2S + C2S
Platform Layer
Spring Boot Modulith, 10+ Bounded Contexts, PostgreSQL, RDF4J
Showcases
ReTrO Ostercappeln (Repair Café, 356 devices, Pre-Live), SobaWi (Pilot Partner)
Where I Stand
What works
- Technical platform runs as a prototype
- Federation with the Fediverse (Mastodon) works
- Food ontologies and taxonomies exist (BLS, FoodOn)
- European grant application submitted
- Network of 8+ organizations, first pilot partner confirmed
What's still a vision
- Zemma Wissa / federated knowledge commons (concept paper completed)
- Open Food Graph – BLS + Open Food Facts as Linked Data
- Recipe sharing via the Fediverse
What's next
- skos-fed – AI-to-AI communication via ActivityPub (working on it now)
- First use case: repair café device catalog via ChangingGraph
- Grant approval – without funding, this stays part-time
About Me
I'm a human who creates connections – with ease and joy. Between people, between systems, between ideas that belong together.
From telecommunications electrician to freelance software architect – self-employed since 1999. Java, Domain-Driven Design, quality engineering. Today with AI-augmented methods. On the island of Reichenau on Lake Constance, I connected the entire broadband network – copper cables, junction points, the physical infrastructure.
The people in repair cafés, community gardens, solidarity groups – they're making the world better, but the digital world ignores them. I want to change that. Not with an app owned by another company. But with open infrastructure that belongs to everyone.
From copper cables on Lake Constance to knowledge graphs in the Fediverse – the common thread has always been: creating connections.
Let's talk
Working on something that makes the world a little better? I'd love to connect – as a developer, a collaboration partner, or just because.