Bypassing Gatekeeper & Not Paying Apple $100

If you are distributing Mac open source software and you don’t want to pay Apple $100 a year and you also dislike providing install instructions for your users like: "hold option and right click, then click open", you can instead use a curl one-liner:

cd /Applications && curl http://mydomain.com/mytarball.tgz | tar x

Your app will now open without invoking Gatekeeper.

Requiring a Terminal command is not ideal either, but the exactness of copy and pasting a simple and short command line means less support requests and less exasperated users.