Best Documentation Open Source Tools in 2026

InfluxDB

Data & Analytics IT Management Web & App Development+1

High-performance time series database with SQL-based querying

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SWE-agent

AI & Machine Learning Web & App Development

Autonomous AI agent that reads code and resolves GitHub issues

stars 19.1Klicense MITlang Python

AI Agents Developer Tools Coding+5

Karakeep

Product & Project Management AI & Machine Learning Business & Productivity

Save links and notes with AI auto-tags, no manual organization

stars 24.9Klicense AGPL-3.0lang TypeScript

AI Agents Workflow Automation Documentation

Trieve

AI & Machine Learning Web & App Development Product & Project Management

Hybrid search and RAG infrastructure for AI knowledge bases

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AI Agents Developer Tools Coding+6

Airbyte

Data & Analytics AI & Machine Learning Web & App Development+1

Open source ELT platform with 300+ data connectors

stars 21.1Klicense NOASSERTIONlang Python

Developer Tools API Infrastructure Database+14

Outline

Communication & Collaboration Business & Productivity Product & Project Management

Modern team wiki and knowledge base, self-hosted or cloud

stars 38.3Klicense NOASSERTIONlang TypeScript

Knowledge Management Documentation Note-taking Apps+4

Stirling PDF

Business & Productivity Security & Monitoring Web & App Development+1

Self-hosted PDF editor with 50+ tools for every PDF task

stars 77.9Klicense NOASSERTIONlang TypeScript

Self Hosted Developer Tools Workflow Automation+4

Okular

Business & Productivity

Multi-platform document viewer supporting PDF, EPUB, and more

stars 1.3Klang C++

Knowledge Management Documentation File Sharing+1

LibreOffice

Business & Productivity

Free office suite with Writer, Calc, and Impress on any platform

stars 3.9Klicense GPL-3.0lang C++

Documentation File Sharing File Sync & Storage+1

DocuSeal

Web & App Development Business & Productivity Finance & Fintech

Open source document signing and fillable PDF forms

stars 11.8Klicense AGPL-3.0lang Ruby

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ProjectDiscovery

Security & Monitoring Web & App Development IT Management+1

Open source security tools for finding vulnerabilities at scale

stars 28.1Klicense MITlang Go

Developer Tools DevOps Tools Cybersecurity+18

Temporal

Web & App Development AI & Machine Learning Business & Productivity+2

Durable workflow orchestration for reliable, long-running apps

stars 19.9Klicense MITlang Go

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