Best open source tools

A lightweight programmer's editor for website files, scripts, and source code.

Host a structured bug database with searchable reports, status histories, and charts.

Run configurable pricing, risk and valuation-adjustment studies

Calculate portfolio returns from a complete transaction history

Keep team chat and calls on a self-hosted collaboration platform.

Explore portfolio weights with explicit return, risk and constraint choices

Run a lightweight flat-file wiki without configuring a database.

Compose screenshot presentations with layers, frames and motion export.

Desktop expense records with refund trackers and batch cleanup tools

Fit portfolio models and evaluate them on later market data

A free, open-source Markdown editor for research notes and long-form writing.

Browser extension that runs local AI chat, summaries and translation through Ollama.

Coordinate recurring household and shared tasks with flexible schedules and fair assignment.

Style batches of screenshots and recordings entirely in the browser.

Inspect the product, model and market inputs behind a valuation

Trace crypto cost-basis calculations and the lots behind each result

Plan personal tasks in a native Linux app with project boards and Todoist or Nextcloud sync.

Track app and website activity locally with a free open-source time tracker.

Track project issues with configurable fields, notifications, and role-based access.

Compare Ethereum issuance, fee burning and supply changes

Desktop wallet connections across Ethereum-compatible networks

Full-node Cardano wallet for desktop computers

Free iPhone expense budgets with recurring entries and iCloud sync

Open-source desktop banking with account searches, exports and offline records