Messenger-for-Desktop | This an official Facebook product

Note: If you download from the releases page, be careful what version you pick. Releases that end with -beta are beta releases, the ones that end with -dev are development releases, and the rest are stable. If you're unsure which to pick, opt for stable. Once you download the app, you'll be able to switch to another channel from the menu.
dev: these releases get the newest and hottest features, but they are less tested and might break things
beta: these releases are the right balance between getting new features early while staying away from nasty bugs
stable: these releases are more thoroughly tested; they receive new features later, but there's a lower chance that things will go wrong
Note: for some tasks, a GitHub access token might be required (if you get errors, make sure you have this token). After you generate it (see here if you need help; repo permissions are enough), set it as an env var: Unix: export GITHUB_TOKEN=123 Windows: set GITHUB_TOKEN=123.
Unix: export GITHUB_TOKEN=123
Windows: set GITHUB_TOKEN=123
If you want to build deb and rpm packages for Linux, you also need fpm. To install it on OS X:.
During development you can use the watch tasks, which have live reload. As you edit files in ./src, they will be re-compiled and moved into the build folder:.