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An open-source iPad notebook for Apple Pencil writing and PDF markup.

Deploy an application from a repository or starter template and configure its runtime in Railway.

Edit, run and share short Kotlin examples in a browser without first creating a full project.

Design API specifications, send requests, generate mocks, run tests, and publish documentation in one project.

Store JSON documents and replicate them across servers and disconnected clients.

A private diary app with mood, media, local-first writing, and optional cloud sync.

Create standalone Spring applications with auto-configuration and an executable application package.

Build web pages and command-line programs with a general-purpose scripting language and interpreter.

A local-first Markdown reader, editor, and notebook that keeps documents as plain files on your device.

Build JVM and multiplatform applications with an open-source language and compiler toolchain.

Deploy Linux virtual machines with selectable regions, images, CPU plans, and SSH access.

Edit a colour system in perceptual coordinates and copy design tokens.

Add a configurable colour picker to ordinary web input fields.

Short visual case studies about product psychology and UX

Analyze paid-channel customer acquisition with order, cohort and lifetime-value context.

Combine navigation, first-impression and task-based UX tests

CRM workflows that distinguish the first matching event from repeated matches

A local-first Markdown notebook and knowledge base with backlinks and optional AI writing.

A pen-first Windows whiteboard for online teachers and tutors.

A statically typed language and compiler toolchain for building native and bytecode programs.

A local-first desktop notebook that stores Markdown notes and canvases on the user’s computer.

Organize a personal knowledge base with block-level notes, references, and bidirectional links.

Usability tests, interviews and research recruitment

Publish a Markdown-first documentation website from project files.