24 free, open-source tools, ranked by how fast they're growing.
Twenty is an open-source customer relationship management (CRM) system that lets teams track contacts, companies and deals. It can be used as a hosted service or self-hosted, and can be extended with custom objects, workflows and AI agents defined as code.
Could replace Salesforce
Tellyscope is an Android phone app that connects to your Android TV, Google TV or Fire TV over Wi-Fi using ADB. It lets you turn off unwanted pre-installed apps, install apps, send files and check how the TV is running, with no root and no PC.
MailCheap is a newsletter app for writing issues, sending them to a mailing list and publishing them on the web. You pay for emails sent rather than for inactive subscribers, and you can self-host it or use the hosted version.
Could replace beehiiv, Mailchimp
ShareX is a free Windows application for capturing screenshots, recording the screen or making GIFs, and then editing and sharing the result. It uploads files to many online destinations and copies a shareable link automatically.
Could replace Snagit, Greenshot Pro
ERPNext is a free, open-source system that brings accounting, stock, orders, manufacturing, assets and projects into one web application. It is for running the day-to-day operations of a business without paying for separate tools for each job.
Could replace NetSuite, SAP Business One
DeckCraft is an open-source presentation tool built in Rust, allowing users to create and edit slide shows with various design elements and features.
Could replace Microsoft PowerPoint
Listmonk is a self-hosted newsletter and mailing list manager with a modern dashboard. It is designed for managing email campaigns and subscriptions.
Could replace MailChimp, SendinBlue
Inbox Zero is an AI assistant that works in the background on a Gmail or Outlook account. It sorts mail, drafts replies, clears unwanted emails and comes with its own email app.
Could replace Superhuman, Fyxer
Documenso is an open-source alternative to DocuSign, allowing users to self-host a document signing service.
Could replace DocuSign, Adobe Sign
NocoBase is an open-source AI + no-code platform for building business systems quickly and reliably. It combines AI with a WYSIWYG no-code interface to allow both developers and non-developers to collaborate on system development.
Could replace Microsoft Power Apps, Salesforce
Medusa is an open-source commerce platform with a built-in framework for customising it. It gives developers ready-made building blocks such as products, carts, orders and payments for building online shops, marketplaces and point-of-sale systems.
Jev-chat is an AI chat assistant that reads and analyzes messages before you reply, suggesting drafts that you can complete with one tap.
DocuSeal is an open-source platform for creating, filling, and signing digital documents, offering a secure and efficient alternative to traditional document signing methods.
Could replace Adobe Sign, Docusign
Appsmith is a low-code platform that allows users to build custom applications like dashboards and admin panels without writing extensive code.
Could replace Bubble
ToolJet is an open-source platform for building internal tools, dashboards, and business applications with a visual builder and AI assistance.
Could replace Microsoft Power Apps
Lago is an open-source billing and monetization platform designed for AI products, enabling the tracking of product usage and turning it into pricing, credits, entitlements, invoices, and payments.
Could replace Stripe, Adyen
OpenWA is a free, open-source WhatsApp API Gateway that allows developers to create and manage WhatsApp bots and integrations without vendor lock-in.
Could replace Twilio, Plivo
Cachet is an open-source, self-hosted status page system that allows businesses to monitor and display the status of their services.
Could replace UptimeRobot, Statuspage.io
PLANKA is an open-source project tracking tool that offers a self-hosted Kanban board for teams. It provides real-time updates and rich markdown support for managing tasks and projects.
Could replace Trello, Asana
Claude SEO is a plugin for Claude Code that audits a website for search engine problems and produces a prioritised action plan. It covers technical SEO, content quality, structured data, local and e-commerce SEO, and how likely AI search tools are to cite your pages.
Zulip is an open-source team chat app that organises conversations into topics within channels, so discussions stay easy to follow. It is for teams who want a self-hosted or hosted alternative to Slack, especially where people work remotely or in different time zones.
Jitsi Meet is an open-source video conferencing platform that runs in the browser and on mobile apps. It lets you host your own video meetings or embed calls in your own website or app.
Plane is an open-source project management tool for tracking tasks, running work cycles and planning product roadmaps. It is for teams who want a self-hostable alternative to Jira, Linear or ClickUp.
Could replace Jira, Linear
PPT Master is a workflow that runs inside an AI coding agent and turns a topic or source documents into an editable PowerPoint file. It produces native shapes, charts, tables, transitions, animations and optional audio narration from speaker notes, and can use your own .pptx templates.
