Initially build for Netscape Navigator, currently powers Mozilla Firefox.
JScript & Chacra – engines developed by Microsoft for their web browsers Internet Explorer and Edge.
MongoDB – document oriented database, uses SpiderMonkey engine.
CouchDB – noSQL database, uses SpiderMonkey engine.
Riak – distributed, noSQL key-value database, uses SpiderMonkey engine.
Thunderbird – email client, uses SpiderMonkey engine.
Adobe Acrobat, Reader, Flash – use SpiderMonkey engine.
GNOME – desktop environment for UNIX-like operating systems, uses SpiderMonkey engine.