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Sebastian Software

Independent software.
Built for everyday work.

Sebastian Software is a product company. We build what we use ourselves, from appointment booking to translation and local websites: practical tools, maintained with care.

Discover the products

TerminaroEarly access

Online appointment booking for small businesses.

Give your customers a simple way to book online, without an account and without cookies on the public booking page. Terminaro syncs with Google, iCloud, or CalDAV calendars to prevent double bookings, sends confirmations and reminders on its own, and keeps booking data on servers in Germany.

Explore Terminaro

A drawn desk calendar with one booked slot, a pen, and a potted plant.
Palamedes+Coming soon

Managed translations built around an open core.

Translation belongs in the product workflow. Palamedes+ is for teams that build on Palamedes, our open-source internationalization core: the core stays open, while catalog upkeep, review, and AI-assisted suggestions become a managed service. It grew out of internationalizing large codebases, where translations should roll out in seconds rather than weeks.

Explore the open core

Drawn books and cards with a Latin letter and a Chinese character beside an open book.
VorOrtComing soon

Managed websites for local businesses.

A website only helps a local business while its opening hours, offers, and everyday information are current. VorOrt sets up a professional website and keeps it current: owners describe what changed in the website chat, confirm the update, and never have to work in a CMS.

Ask us about VorOrt

A drawn shop front with a striped awning, a blank sandwich board, and potted trees.
A drawn landscape with the cathedral of Mainz above and Heidelberg castle with its old bridge below.

Independent since 2014.

Based in Mainz and Heidelberg, rooted in the Rhine-Main and Rhine-Neckar regions. Two founders run the company themselves.


Experience.
Clarity.
Enthusiasm.


Open foundations

We share the tools behind our work as open source: Rust engines, TypeScript libraries, and skills for coding agents.

Explore our open source projects

Palamedes

Internationalization for TypeScript applications: message extraction, catalogs, and framework adapters.

View on GitHub

Ferramenta

A family of Rust-native engines and applications for documents and text.

View on GitHub

Newsletter

Insights into our work across software and consulting: what we're building, exploring and thinking about.

Need a clearer direction for your software?

Our agency helps teams with software architecture, engineering and technical direction.

Meet Sebastian/Consulting

A drawn road winding through a valley toward the mountains.