open-source

HTTP health checks and URL monitoring — simple and self-hosted

All-in-one tool for keeping track of your domain name portfolio

Simple invoicing REST API — send JSON, get a PDF

Open-source CRM with projects, invoicing, email and AI features

Minimalist open-source budget tracking across the years

Open-source personal finance tracking with SMS transaction parsing

Extremely simple, self-hosted expense tracker with a beautiful UI

Super simple PDF invoicing library for Ruby

Free open-source calendar availability picker — Calendly alternative

Self-hosted, Markdown-based task management board