OSS Discovery

US
United States
WEB & MOBILE FRAMEWORKS
CLOUD-READY
ACTIVELY MAINTAINED
FREE
Mailspring

MAILSPRING

"Unlock seamless email management with Mailspring, the premium open-source mail client for Mac, Linux, and Windows. Boost productivity with read receipts, link tracking, send later, and follow-up reminders. Built on Electron, React, and Mailcore2, Mailspring elevates your workflow with speed, efficiency, and customization."

GITHUB STARS
17k
+12% this month
FORKS
984
Active community
LAST PUSH
Apr 24, 2026
High momentum
WATCHERS
180
Tracking updates
LICENSE
GPL-3.0
Commercial use
**Mailspring** is a mail client that manages email. It is built for email users who need to boost productivity. Mailspring runs on Mac, Linux, and Windows.

High Performance

Built for speed and minimal overhead.

Self-hostable

Docker, Kubernetes, or bare metal

Developer Native

Programmable via any language workflow

SUPPORTED LANGUAGES

JavaScript
JavaScript
TypeScript
TypeScript
Fluent
Fluent
HTML
HTML
Less
Less
CSS
CSS
Shell
Shell
VBScript
VBScript
Batchfile
Batchfile

VISUAL INTERFACE

Screenshot 1
Screenshot 2
Screenshot 3

The Quick Glance

Status
Active
Category
Web & Mobile Frameworks
Pricing
Free
Self-Hosted
No
Available on
Linux
Web
Latest Release
1.20.1
Apr 20, 2026

Relative Standing — across 1,284 tools

STARS17k
Top 23% globally
FORKS984
Top 34% in Open Source
ACTIVITYModerate
Top 54% Activity
WATCHERS180
Top 20% Community