Find the best open-source alternatives to popular software.

Free invoicing software for freelancers and small businesses. Create professional invoices, track expenses, accept online payments, and manage projects without hidden fees.

Open-source billing system that handles metering, usage-based pricing, and invoicing at scale. Perfect for AI, cloud, and API companies needing flexible monetization.

AutoMQ is a serverless Kafka alternative built on S3 that offers 10x cost savings, easy scalability, and full Kafka compatibility.

Monitor servers, websites, Docker containers, and infrastructure with real-time insights, instant alerts, and powerful analytics. Self-hosted solution.

Free and open source painting program built by artists for artists. Features professional brushes, layers, animation tools, and drawing assistants for all skill levels.

Open-source software designed to streamline tasks, boost productivity, and enhance collaboration for teams of all types, including those with ADHD and neurodiversity.

Open source observability platform unifying session replays, logs, traces, metrics and errors. Fast search, automatic clustering, $0.40/GB pricing.

Open-source platform for LLM tracing, evaluation, and optimization. Features automatic instrumentation, prompt playground, and real-time AI application monitoring.

Comprehensive monitoring solution offering error tracking, session replay, and performance insights for seamless debugging and optimization.

Databend is an open-source, elastic cloud data warehouse built for high-performance analytics and seamless integration with popular data tools.

A digital marketplace platform where creators can sell digital products, from courses to software, with built-in payment processing and content delivery.

Fully managed backend infrastructure with built-in authentication, database, storage, and serverless functions for rapid application development.

Deep Lake is an open-source database for storing, querying and managing complex AI data like images, audio, and embeddings.

Streamline user authentication with passwordless login, enhancing security and user experience for your web applications.

Open-source answer engine that dynamically generates UI components while providing AI-powered responses, combining conversational AI with interactive interfaces.

A versatile form builder for crafting custom surveys, quizzes, and data collection tools with advanced features and integrations.

Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.

Open-source data pipeline platform for effortless data integration, transformation, and orchestration using Python, SQL, and R.

Drag-and-drop interface for creating and optimizing digital experiences, with headless CMS and powerful integrations.

Seamlessly track time across multiple projects, generate insightful reports, and optimize your open source contributions.

Replace your VPN with zero-trust access built on WireGuard. Fast, scalable network security with simple policies and identity provider integration.

Open-source wealth management software for tracking stocks, ETFs, and cryptocurrencies across multiple portfolios

Open-source uptime monitoring platform for seamless service management, real-time alerts, and comprehensive status pages

Powerful no-code platform for building responsive websites. Combines visual editing with full HTML/CSS customization.

An all-in-one personal finance platform. Track, optimize, grow, and manage your money through every stage of life.

An intelligent note-taking assistant that combines your quick notes with meeting transcripts to create comprehensive, organized meeting summaries automatically.

Create, run, and share mock REST APIs without coding. Boost productivity with an intuitive interface and powerful features.

Crater offers AI-driven invoicing workflows, payments, and working capital tools to enhance your platform with minimal technical effort.

Secure, customizable platform for sharing documents and tracking engagement. Perfect for sales teams, marketers, and businesses.

A headless, API-first e-commerce framework built on Node.js with TypeScript, offering customization and scalability for online stores.