The tools we work with

Apache-2.0 licensed container engine: containers, Compose, volumes, networks. Example: how a construction company with 25 staff runs eight services (Caddy, Nextcloud, Mailcow, BookStack, Vaultwarden, Uptime Kuma, n8n, Open WebUI) isolated on a single mini PC — no SaaS, no cloud lock-in.

Zlib licensed web UI for Docker, Compose and Swarm: stack editor, log stream, volume browser, multi-endpoint, container console. Example: how a marketing studio with its own UGREEN NAS manages twelve containers in the browser — without SSH, without Docker vocabulary.

Apache-2.0 licensed web server with automatic Let's Encrypt certificates, HTTP/3, declarative Caddyfile syntax and hot reload. Example: how a web agency runs 30 client domains in a single Caddyfile — no Certbot cron jobs, no SSL outage tickets.

MIT licensed mail-server container: Postfix + Dovecot + Rspamd + ClamAV + Fail2ban, DKIM/SPF/DMARC ready, setup.sh for every admin task. Example: how a German structural engineering office migrated from Strato to its own mail server — unlimited project aliases, Bayes-trained spam filter, 100 % mail sovereignty.

Open-source monitoring for websites, APIs, mail servers, databases and Docker containers. Status pages for customers, notifications into your own inbox, all data on your own server. Example: how a tax office monitors its client portal, DATEV login, mail server and backup jobs with it.

AGPL-3.0 licensed platform for dashboards, alerting and multi-data-source visualisation. Example: how a German private brewery with 18 staff monitors 12 fermentation tanks with IoT sensors — real-time fermentation curves, Slack alerts on temperature drift, automatic brew protocols.

MIT licensed server for 100+ open-weight models (Llama, Mistral, Qwen, Gemma): OpenAI-compatible API, GPU acceleration (NVIDIA/AMD/Apple), quantisation for RAM/VRAM efficiency. Example: how a German machine-building company with 80 staff replaced shadow IT (clandestine ChatGPT use) with a local AI server — IP protection instead of data leakage.

Browser interface for local models (Llama, Mixtral, Qwen) via Ollama: multi-user with RBAC, audit log, RAG over your own documents, OpenAI-compatible API. Example: how a German law firm with 8 staff runs § 203-compliant brief drafting, contract analysis and case-law research — without client data ever leaving the firm.

Fair-code workflow tool for email triggers, OCR, DATEV export, Slack bridges and CRM integrations. 400+ pre-built nodes, visual editor, runs on your own server. Example: how a tax firm with 60 clients automates its document intake, monthly P&L dispatch and deadline watchdog.

Apache-2.0 licensed BPMN 2.0 workflow engine + DMN decision engine in Java with user task inbox and cockpit. Example: how a German special machine builder with 60 staff turns engineering approval workflows from email threads into BPMN processes with user tasks, parallel paths and audit trail.

AGPL-3.0 licensed Rust reimplementation of the Bitwarden server: one container, ~50 MB RAM, fully compatible with every official Bitwarden app (iOS, Android, browser extension). Example: how a German architecture firm with 12 staff and 80 building projects manages 1,800+ logins without a SaaS vault.

GPL-3.0 licensed DMS for trade businesses and SMBs: Tesseract OCR local, PostgreSQL full-text search, ML auto-tagging, REST API, GoBD-compliant retention. Example: how a German HVAC business archived 7,400+ delivery notes, maintenance contracts and BAFA subsidy applications in 18 months — search in under a second.

MIT licensed wiki with WYSIWYG + Markdown, full-text search, REST API, multi-user. Example from our own practice: we have used BookStack for 18 months for 400+ pages of internal knowledge — this entire tools section was developed from BookStack storyboards.

MIT licensed scheduling tool: self-service slots, availability management, recurring appointments, reminder emails. Example: how a German psychotherapy group practice with 4 therapists and 240 patients runs its scheduling Art. 9 GDPR compliant — saving €5,000–9,000 per year compared to Doctolib.

Vanilla WordPress + Block Editor + AI workflow (ChatGPT, Claude, Ollama, n8n) replaces the expensive plugin stack. Example: how a neighbourhood restaurant maintains its site daily — from €700/year plugin stack down to €190/year, daily updates in 15 minutes via smartphone.

Apache-2.0 licensed headless CMS with content as Markdown/MDX in a Git repository and a visual editor in the browser. Schema definition in TypeScript, automatic type generation. Fits Next.js, Astro or Hugo sites with editorial maintenance.