Best open source tools

A free Android Markdown notebook for notes, task lists, reminders, and attachments.

Capture terminal sessions as text-based recordings, replay them locally, and share or stream them on the web.

Plan each workday with a task list, timeboxing, focus timers, and built-in time tracking.

Substrate explorer for multisig approvals, proxy links and vesting

Plan project tasks, dependencies, resources, and costs with an offline desktop Gantt tool.

Run a Bitcoin Lightning node on an Android or iOS phone

Mobile wallet that exposes the provider and minimum output in swap quotes

Stellar asset data and ledger-time lookups through a free public API

Open-source wallets with contacts, favorites and backup choices

Build interactive terminal interfaces in Rust with reusable widgets and responsive layouts.

Experiment with Lightning-funded ecash and NFC transfers

Manage a structured to-do list from the command line with projects, priorities, tags, and reports.

Embed Perl-compatible regular-expression matching in applications through a portable C library.

A private, open-source writing app built around searchable notes, pins, and trails.

Teach with a free, open-source interactive whiteboard for schools and universities.

Manage plain-text task lists from the shell with a simple and extensible command-line tool.

Turn results from supported test frameworks into interactive reports with history, steps and failure context.

Generate a tags index of source-code definitions for navigation from a compatible editor or tool.

Free open-source desktop GUI prototyping

Self-host an appointment booking page and team calendar, or use the project’s managed hosting.

A freely downloadable, GPL-licensed database with SQL, replication, connectors, and administration tools.

A local-first team notebook for real-time collaboration on plain Markdown files.

Monero desktop wallet with transaction review and Tor controls

Sentry-SDK-compatible error monitoring, available hosted or self-hosted.