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Handpicked Open Source Alternatives to Paid Softwares

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421 projects, sorted by GitHub stars.

Mailflare

Alternative toFastmail

Self-hosted email inbox for custom domains on Cloudflare

  • 5,117 GitHub stars
  • AGPL-3.0Licence AGPL-3.0

Digger

Alternative toHashiCorp Terraform Cloud

Self-hosted Terraform CI/CD that runs natively in GitHub Actions

  • 5,056 GitHub stars
  • MITLicence MIT

Frappe Books

Alternative toQuickBooks Online

Free bookkeeping app for small businesses, stores data locally

  • 4,998 GitHub stars
  • AGPL-3.0Licence AGPL-3.0

OrientDB

Alternative toAzure Cosmos DB

Multi-model NoSQL database: graphs, docs, and key-value

  • 4,995 GitHub stars
  • Apache-2.0Licence Apache-2.0
  • #Database

Flipt

Alternative toLaunchDarkly

Feature flags that store and evaluate on your own infrastructure

  • 4,923 GitHub stars
  • MITLicence MIT

stt

Alternative toMacWhisper

Local speech-to-text with multi-format output and GPU acceleration

  • 4,823 GitHub stars
  • GPL-3.0Licence GPL-3.0

MiroTalk

Alternative toZoom

Free browser-based video calls with no sign-up required

  • 4,800 GitHub stars
  • AGPL-3.0Licence AGPL-3.0
  • #Chat

Thunderbolt

Alternative toChatGPT

Control your AI infrastructure with Thunderbolt

  • 4,799 GitHub stars
  • MPL-2.0Licence MPL-2.0
  • #AI Agents

DeskcommCRM

Alternative toHubSpot Sales Hub

AI agents for WhatsApp sales, fully audited, no per-user pricing

  • 4,751 GitHub stars
  • MITLicence MIT
  • #CRM

Matrix

Alternative toSlack

Open protocol for secure, decentralized messaging and VoIP

  • 4,716 GitHub stars
  • AGPL-3.0Licence AGPL-3.0
  • #Chat

PDFsam Basic

Alternative toAdobe Acrobat

Split, merge, rotate, and extract PDF pages for free

  • 4,632 GitHub stars
  • AGPL-3.0Licence AGPL-3.0

Cerbos

Alternative toPlainID

Move access control out of app code into testable YAML policies

  • 4,627 GitHub stars
  • Apache-2.0Licence Apache-2.0
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