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# Who uses Mercurial

**Mercurial is a free, distributed source control management tool. It is currently used
by many projects such as...**

```{rubric} Facebook
```

The social networking service Facebook
[chose Mercurial](https://engineering.fb.com/2014/01/07/core-infra/scaling-mercurial-at-facebook/)
in 2014 due to its extensibility and the ability to make it work at scale.

<https://www.facebook.com>

```{rubric} Mozilla
```

Mozilla is an open source project that is currently developing the popular
[Firefox](https://www.mozilla.org/firefox) internet browser, the email client
[Thunderbird](https://www.thunderbird.net) and the application suite SeaMonkey. Mozilla
chose Mercurial in 2006.

<https://www.mozilla.org>

```{rubric} and others...
```

Not just Facebook and Mozilla use Mercurial. A lot of projects of various sizes have
decided to use Mercurial for its efficiency and power. A longer list of projects which
use Mercurial can be found
[in the wiki](https://wiki.mercurial-scm.org/ProjectsUsingMercurial).