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Now listing open-source alternatives · updated Jun 10, 2026

Open Source Alternatives to Paid Software

Browse a curated directory of self-hosted tools that replace paid software. Every listing is manually reviewed for active maintenance, practical fit, and transparent licensing.

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Open source alternatives to paid software directory

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Handpicked Open Source Alternatives to Paid Softwares

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icon of LocalSend

LocalSend

stars 81.2Kforks 4.4K

Free cross-platform file sharing over local network, no cloud

File SharingFile Sync & StoragePrivacy Tools+2
Cal.diy icon

Cal.diy

stars 45.3Kforks 14K

MIT self-hosted scheduling without Cal.com enterprise code

Calendars & SchedulingAPI InfrastructureSelf Hosted+2
icon of AppFlowy

AppFlowy

stars 72.2Kforks 5.4K

Open source Notion alternative with AI, self-hosted

Project ManagementKnowledge ManagementNote-taking Apps+5
icon of Rocket.Chat

Rocket.Chat

stars 45.3Kforks 13.6K

Self-hosted team chat with voice, video, and omnichannel support

ChatSelf HostedCustomer Support+5
icon of RuView

RuView

stars 59.5Kforks 7.8K

Intelligent AI agents for real-world applications

AI AgentsIoTDeveloper Tools+2
icon of AnythingLLM

AnythingLLM

stars 61.5Kforks 6.7K

Chat with your documents using any LLM, private and self-hosted

AI AgentsSelf HostedLLM+5
icon of Traefik

Traefik

stars 63.6Kforks 6K

Auto-routing reverse proxy for Docker and Kubernetes from labels

API InfrastructureKubernetesDocker Management+4
icon of Cline

Cline

stars 61.7Kforks 6.4K

VS Code AI agent that plans and edits across your entire project

AI Coding AssistantAI AgentsDeveloper Tools+3
icon of Cognitum

RuFlo

stars 59Kforks 6.8K

Deploy intelligent AI agents with ease.

AI AgentsDeveloper ToolsInfrastructure as Code+2
icon of Unsloth

Unsloth

stars 64.2Kforks 5.7K

Train LLMs locally without code using a browser-based interface

LLMLLMOpsNo Code+3
icon of AFFiNE

AFFiNE

stars 68.3Kforks 4.8K

Local-first workspace combining docs, whiteboards, and notes

Knowledge BaseNote-taking AppsDocumentation+4
icon of Gitea

Gitea

stars 55.6Kforks 6.7K

Self-hosted GitHub alternative with CI, issues, and PRs

GitSelf HostedDevOps Tools+4
icon of Discourse

Discourse

stars 47.2Kforks 8.9K

Open source forum and community platform, self-hosted

ChatCMSSelf Hosted+3
icon of Caveman

Caveman

stars 70.7Kforks 4K

Token-slashing caveman-speak for cheaper, faster AI code.

LLMPrompt EngineeringAI Coding Assistant+2
icon of ClickHouse

ClickHouse

stars 47.9Kforks 8.5K

Fast open source column-oriented database for analytics

DatabaseDeveloper ToolsCloud Native+2
icon of Joplin

Joplin

stars 54.8Kforks 6.1K

Open source note-taking app with Markdown and sync support

Note-taking AppsKnowledge ManagementFile Sync & Storage+3
icon of Twenty

Twenty

stars 49.7Kforks 7.2K

Self-hosted open source CRM with a customizable data model

CRMSelf HostedWorkflow Automation+4
icon of Appwrite

Appwrite

stars 56.3Kforks 5.4K

Self-hosted backend: auth, databases, storage, and functions

Developer ToolsAPI InfrastructureSelf Hosted+4
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