$ brew install syncthing
http://127.0.0.1:8384/
Create the file ~/Library/LaunchAgents/syncthing.plist
$ vi ~/Library/LaunchAgents/syncthing.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<!--
Make sure the "syncthing" executable is located at ~/bin/syncthing.
Replace the string "USERNAME" in this file with your username, such as "jb".
Copy this file to ~/Library/LaunchAgents/syncthing.plist.
Execute "launchctl load ~/Library/LaunchAgents/syncthing.plist".
-->
<plist version="1.0">
<dict>
<key>Label</key>
<string>net.syncthing.syncthing</string>
<key>ProgramArguments</key>
<array>
<string>/usr/local/bin/syncthing</string>
</array>
<key>EnvironmentVariables</key>
<dict>
<key>HOME</key>
<string>/Users/egbert</string>
<key>STNORESTART</key>
<string>1</string>
</dict>
<key>KeepAlive</key>
<true/>
<key>LowPriorityIO</key>
<true/>
<key>ProcessType</key>
<string>Background</string>
<key>StandardOutPath</key>
<string>/Users/egbert/Library/Logs/Syncthing.log</string>
<key>StandardErrorPath</key>
<string>/Users/egbert/Library/Logs/Syncthing-Errors.log</string>
</dict>
</plist>
Unload with
launchctl unload ~/Library/LaunchAgents/syncthing.plist
Load with
launchctl load ~/Library/LaunchAgents/syncthing.plist