# Zephyr

A real-time operating system for microcontrollers, under the Linux Foundation. It fits in a few kilobytes of memory and supports hundreds of boards; it has become the serious free alternative to the proprietary systems in that market. The 3.7 branch is the long-term support one.

- **Category:** Embedded
- **License:** Apache-2.0
- **Official Site:** https://www.zephyrproject.org/
- **Download:** https://docs.zephyrproject.org/latest/develop/getting_started/index.html
- **Original page:** https://linuxgratis.com/en/zephyr

## Releases

| Version | Release Date | End of Support | Status |
| --- | --- | --- | --- |
| 4.4 | 2026-04-14 | - | Active |
| 4.3 | 2025-11-13 | 2026-04-14 | EOL |
| 4.2 | 2025-07-19 | 2025-11-13 | EOL |
| 4.1 | 2025-03-07 | 2025-07-19 | EOL |
| 4.0 | 2024-11-16 | 2025-03-07 | EOL |
| 3.7 | 2024-07-26 | 2024-11-16 | EOL |