GitHub Open Source Insight
Computed at Sep 11, 2026GitHub repo leaderboard by stars, growth rate and activity.
novuhq
The open-source communication infrastructure for agents and products
TypeScript39,962 starslast pushed Yesterdaynylas
:love_letter: An extensible desktop mail app built on the modern web. Forks welcome!
JavaScript24,732 starslast pushed 3 months agoPHPMailer
mjmlio
MJML: the only framework that makes responsive email easy
JavaScript18,234 starslast pushed YesterdayBillionmail
BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr
Go15,567 starslast pushed 3 months agomegadose
holehe allows you to check if the mail is used on different sites like twitter, instagram and will retrieve information on sites with the forgotten password function.
Python14,843 starslast pushed 2 years agologto-io
🧑🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.
TypeScript14,511 starslast pushed 21 hours agothunderbird
Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)
Kotlin13,977 starslast pushed YesterdayOdysseusYuan
elie222
The world's best AI personal assistant for email. Open source app to help you reach inbox zero fast.
TypeScript12,178 starslast pushed 23 hours ago
| # | Repo | Language | Stars | 30-day trend | Last updated |
|---|---|---|---|---|---|
| 1 | novuhq The open-source communication infrastructure for agents and products | TypeScript | 39,962 | last pushed Yesterday | |
| 2 | nylas :love_letter: An extensible desktop mail app built on the modern web. Forks welcome! | JavaScript | 24,732 | last pushed 3 months ago | |
| 3 | PHPMailer The classic email sending library for PHP | PHP | 22,296 | last pushed 5 days ago | |
| 4 | mjmlio MJML: the only framework that makes responsive email easy | JavaScript | 18,234 | last pushed Yesterday | |
| 5 | Billionmail BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr | Go | 15,567 | last pushed 3 months ago | |
| 6 | megadose holehe allows you to check if the mail is used on different sites like twitter, instagram and will retrieve information on sites with the forgotten password function. | Python | 14,843 | last pushed 2 years ago | |
| 7 | logto-io 🧑🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC. | TypeScript | 14,511 | last pushed 21 hours ago | |
| 8 | thunderbird Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail) | Kotlin | 13,977 | last pushed Yesterday | |
| 9 | OdysseusYuan 一键自动化 下载、安装、激活 Office 的利器。 | C# | 12,645 | last pushed 3 years ago | |
| 10 | elie222 The world's best AI personal assistant for email. Open source app to help you reach inbox zero fast. | TypeScript | 12,178 | last pushed 23 hours ago |
All · 11,474