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Weak copyleft

Mozilla Public License 2.0

File-level weak copyleft: modified MPL files stay under MPL, while larger works may use other licenses.

Compared to common options: Weaker than GPL/AGPL (file-level); stronger than MIT/Apache for modified covered files.

Generally allows

  • Commercial use
  • Modification
  • Distribution
  • Patent use
  • Private use

Typically requires

  • Disclose source for MPL-covered files you distribute
  • Include license notices
  • Document changes to covered files

Watch-outs

  • Removing license notices
  • Holding contributors liable

How teams usually use it

  1. Useful when you want copyleft on specific files without forcing the entire product under copyleft.
  2. When distributing binaries that include modified MPL files, offer corresponding source for those files.
  3. Keep MPL headers on covered files and avoid mixing incompatible terms into the same file.
Official & reference sources

Orientation only — not legal advice. Always verify the repository LICENSE file, notices, and dependency terms, and obtain counsel for commercial distribution decisions.

Projects declared under MPL-2.0.

Inspect repositories, stacks, activity, and alternatives across catalog projects that declare MPL-2.0.

12 projects connectedAlways verify the repository LICENSE file and obtain legal advice when needed.
Syncthing
GermanyMPL-2.0

Open Source Continuous File Synchronization

Content & CollaborationOpen-source projects grouped in this category for discovery and comparison.3 projects#GoProjects tagged with this topic in the verified catalog.4 projectsgoProjects tagged with this topic in the verified catalog.3 projectsp2pProjects tagged with this topic in the verified catalog.1 projectFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree and open sourceFree86.4K5.4K3 days ago
Alternatives toFirefoxFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives+2
Penpot
SpainMPL-2.0

Penpot: The open-source design platform for Product teams that need scalable collaboration.

InfrastructureOpen-source projects grouped in this category for discovery and comparison.3 projects#ClojureProjects tagged with this topic in the verified catalog.1 projectGithub ActionsProjects tagged with this topic in the verified catalog.8 projectsJavaScriptProjects tagged with this topic in the verified catalog.7 projectsCanvaProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…1 alternative
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree self-hosted; Penpot Cloud availableFree56.5K3.7K29 hours ago
Alternatives toCanvaCanvaProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…1 alternative+5
Zen Browser
SpainMPL-2.0

Welcome to a calmer internet

InfrastructureOpen-source projects grouped in this category for discovery and comparison.3 projects#JavaScriptProjects tagged with this topic in the verified catalog.7 projectsGithub ActionsProjects tagged with this topic in the verified catalog.8 projectsNodeJSProjects tagged with this topic in the verified catalog.7 projectsFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree and open sourceFree43.4K1.6K36 hours ago
Alternatives toFirefoxFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives+3
OpenTofu
MPL-2.0

OpenTofu lets you declaratively manage your cloud infrastructure.

InfrastructureOpen-source projects grouped in this category for discovery and comparison.3 projects#GoProjects tagged with this topic in the verified catalog.4 projectsGithub ActionsProjects tagged with this topic in the verified catalog.8 projectsJavaScriptProjects tagged with this topic in the verified catalog.7 projectsSelf-hostedThis project carries a self-hosting or local-deployment signal. Verify the official install guide before production use.1 self-hosted optionRed Hat AnsibleProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…1 alternative
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree and open sourceFree29.4K1.3K30 hours ago
Alternatives toRed Hat AnsibleRed Hat AnsibleProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…1 alternative+2
Brave
MPL-2.0

Brave browser for Android, iOS, Linux, macOS, Windows.

Content & CollaborationOpen-source projects grouped in this category for discovery and comparison.3 projects#Github ActionsProjects tagged with this topic in the verified catalog.8 projectsJavaScriptProjects tagged with this topic in the verified catalog.7 projectsNodeJSProjects tagged with this topic in the verified catalog.7 projectsFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree and open sourceFree23.1K3.2K28 hours ago
Alternatives toFirefoxFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives+4
ActivityWatch
MPL-2.0

The best free and open-source automated time tracker. Cross-platform, extensible, privacy-focused.

Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.3 projects#PythonProjects tagged with this topic in the verified catalog.2 projectsGithub ActionsProjects tagged with this topic in the verified catalog.8 projectsBashProjects tagged with this topic in the verified catalog.7 projectsWakaTimeProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…1 alternative
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree and open sourceFree18.2K95410 days ago
Alternatives toWakaTimeWakaTimeProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…1 alternative+2
Logto
MPL-2.0

🧑‍🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.2 projects#TypeScriptProjects tagged with this topic in the verified catalog.3 projectsGithub ActionsProjects tagged with this topic in the verified catalog.8 projectsJavaScriptProjects tagged with this topic in the verified catalog.7 projectsAI-nativeThis project includes AI-native capability signals in the catalog metadata.2 AI-native projectsClerkProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…1 alternative
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree and open sourceFree14.2K1.1K30 hours ago
Alternatives toClerkClerkProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…1 alternative+4
Encore
MPL-2.0

The infrastructure platform for the intelligence era

Data & AnalyticsOpen-source projects grouped in this category for discovery and comparison.1 project#GoProjects tagged with this topic in the verified catalog.4 projectsGithub ActionsProjects tagged with this topic in the verified catalog.8 projectsJavaScriptProjects tagged with this topic in the verified catalog.7 projectsSupabaseOpen-core backend platform often compared with Firebase.1 alternative
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree and open sourceFree12.2K60333 hours ago
Alternatives toSupabaseSupabaseOpen-core backend platform often compared with Firebase.1 alternative+2
Floorp
MPL-2.0

All of source code of Floorp 12, the most Advanced and Fastest Firefox derivative 🦊

Content & CollaborationOpen-source projects grouped in this category for discovery and comparison.3 projects#TypeScriptProjects tagged with this topic in the verified catalog.3 projectsbrowserProjects tagged with this topic in the verified catalog.2 projectsfirefoxProjects tagged with this topic in the verified catalog.2 projectsFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree and open sourceFree8.3K25927 hours ago
Alternatives toFirefoxFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives+2
OpenBao
MPL-2.0

OpenBao is an open source, community-driven secrets manager and fork of Vault managed by the Linux Foundation's OpenSSF.

Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.3 projects#webProjects tagged with this topic in the verified catalog.1 projectit-securityProjects tagged with this topic in the verified catalog.1 projectWebDocumented runtime or deployment platform for this open-source project.1 projectFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives
EUOtherFederated from Other in the EU Open Source Solutions Catalogue. Software type: Standalone/Web.Stable · It Security · Identity ManagementStableStableMarked Stable in the EU OSS Catalogue: considered ready for production use by the publishing public administration.EU OSS Catalogue maturity
6.7K95/100Vitality 95/100Very active. The EU OSS Catalogue vitality index (0–100) is an AGID-compatible score of recent repository activity—commits, releases, and contributor signals—not a quality or security rating.EU OSS Catalogue · AGID-compatibleActivity unavailable
Alternatives toFirefoxFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives+2
CloudQuery
MPL-2.0

Data pipelines for cloud config and security data. Build cloud asset inventory, CSPM, FinOps, and vulnerability management solutions. Extract from AWS, Azure, GCP, and 70+ cloud and SaaS sources.

Security & PrivacyOpen-source projects grouped in this category for discovery and comparison.3 projects#GoProjects tagged with this topic in the verified catalog.4 projectsGithub ActionsProjects tagged with this topic in the verified catalog.8 projectsJavaScriptProjects tagged with this topic in the verified catalog.7 projectsSnowflakeProprietary cloud data warehouse platform.1 alternative
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree and open sourceFree6.5K5492 days ago
Alternatives toSnowflakeSnowflakeProprietary cloud data warehouse platform.1 alternative+3
Thunderbolt
MPL-2.0

AI You Control: Choose your models. Own your data. Eliminate vendor lock-in.

AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.2 projects#TypeScriptProjects tagged with this topic in the verified catalog.3 projectsaiProjects tagged with this topic in the verified catalog.1 projectai-agentsProjects tagged with this topic in the verified catalog.1 projectAI-nativeThis project includes AI-native capability signals in the catalog metadata.2 AI-native projectsFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives
Metrics syncingMetrics syncingStar momentum for this project has not landed in the latest GitHub metrics sync yet. Check trending for repositories with recorded momentum.Browse trending →
FreePricingFree and open sourceFree4.7K31826 hours ago
Alternatives toFirefoxFirefoxProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…2 alternatives+2
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