The Holding Company
Thank You, Open Source
Nearly everything The Holding Company operates — our websites, our products, our internal platform — is built on open source software. That software is written, reviewed, documented, and maintained by people who chose to share their work with the world. This page exists to say, plainly: thank you.
Below are some of the projects we rely on every day. It is a representative list, not an exhaustive one — behind each of these sit hundreds of libraries and their maintainers who deserve the same gratitude.
Runtime & infrastructure
- Docker / Moby — the container runtime underneath most of what we run.
- Colima and Lima — container runtimes on macOS, done right.
- NGINX — quietly serving our sites for years.
- Python — the glue that holds our automation together.
- Node.js — powering our web tooling and services.
- PostgreSQL — the database we trust with the data that matters.
- MariaDB — dependable storage for several of our applications.
- Redis — caching and queues, fast and boring in the best way.
- NATS — the messaging backbone of our agent platform.
- SQLite — the most widely deployed database on Earth, and one of the best-engineered.
Observability
- Grafana, Prometheus, and Loki — dashboards, metrics, and logs for the whole fleet.
- Plausible Analytics — privacy-respecting web analytics we can self-host.
- Dozzle — instant container log visibility.
Applications we self-host
- Nextcloud — files and collaboration on our own terms.
- n8n — workflow automation between our services.
- Cal.com — open scheduling.
- Grist — the relational spreadsheet behind our lightweight CRM.
- FreeScout — a helpdesk without the seat tax.
- Shlink — the engine behind our gad6.com link shortener.
- Zot — a clean, OCI-native artifact registry.
- Portainer — container management with a human face.
- Langfuse — observability for our LLM applications.
- Wiki.js — publishing our knowledge base.
Developer tools
- Git — the foundation of how we build.
- GitHub CLI — our daily driver for repos, PRs, and releases.
- Homebrew — package management on macOS, maintained by volunteers.
- Zsh — the shell we live in.
- curl — a masterclass in long-term maintainership.
- jq — JSON surgery on the command line.
- D2 and Mermaid — our diagrams as code.
Giving back
Gratitude is cheap; contribution is not. We try to give back the ways a small operator can: filing clear, reproducible bug reports upstream, sharing fixes and configuration lessons publicly, publishing pieces of our own work as open source, and paying for the hosted or supported tiers of open-core projects we depend on. If you run a business on open source, we encourage you to do the same — and to fund the maintainers whose work you profit from.
If you maintain any of the projects above: thank you. Your work runs this company.