The following GITHUB repo contains .JSON Extractor files (Log Parsers) for use with GrayLog 2.2.x and above: these include:

• Untangle NG Firewall version 12
• Untangle NG Firewall version 13
• Symantec (BlueCoat) SSLV version 3.x+
• pfSense / OPNsense Firewall
• Ubiquiti Unifi and EdgeRouterX
• VMware ESX/ESXi and vCenter 5.5+
• hMailServer
• LogRhythm Network Monitor (NetMon)
• Infoblox NIOS 7.xx-8.xx
• CISCO 3725