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209 projects, sorted by GitHub stars.

LibreOffice

Alternative toMicrosoft 365

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

  • 4,540 GitHub stars
  • GPL-3.0Licence GPL-3.0

FckSignups

InCustomer Support

Open-source tools that work instantly, no signup required

  • 4,511 GitHub stars
  • GPL-3.0Licence GPL-3.0

OpenPDF

Alternative toiText 7

Free open source Java library for creating and editing PDFs

  • 4,378 GitHub stars

Donut Browser

Alternative toMultilogin

Anti-detect browser with isolated profiles and zero telemetry

  • 4,084 GitHub stars
  • AGPL-3.0Licence AGPL-3.0

crm

Alternative toHubSpot CRM

Self-hostable CRM with unlimited users and Kanban deal tracking

  • 3,837 GitHub stars
  • AGPL-3.0Licence AGPL-3.0
  • #CRM

LimeSurvey

Alternative toSurveyMonkey

Open source survey platform for complex questionnaires

  • 3,769 GitHub stars
  • GPL-2.0Licence GPL-2.0

Ploomber

Alternative toGoogle Cloud Composer

Build reproducible Python data pipelines with DAG orchestration

  • 3,620 GitHub stars
  • Apache-2.0Licence Apache-2.0

EspoCRM

Alternative toSalesforce Sales Cloud

Self-hosted open source CRM for contacts and pipelines

  • 3,503 GitHub stars
  • AGPL-3.0Licence AGPL-3.0
  • #CRM

Atomic Agent

Alternative toGrok Bot

Local-first AI agent that runs on your machine, drives real tools.

  • 3,425 GitHub stars
  • MITLicence MIT
  • #LLM

Apache PDFBox

Alternative toiText 7

Open source Java library for creating and parsing PDFs

  • 3,133 GitHub stars
  • Apache-2.0Licence Apache-2.0

Pstack Claude

InAI & Machine Learning

Structured coding workflows for Claude Code, Codex, and Pi

  • 3,102 GitHub stars
  • MITLicence MIT

Paymenter

Alternative toWHMCS

Self-hosted billing for hosting providers, MIT licensed

  • 2,770 GitHub stars
  • MITLicence MIT
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