I'm an open source developer. I use Python, Django, PostgreSQL, JQuery, MongoDB, Memcached, and Redis. I push production code to Linux servers.
- My laptop runs Apple's Mac OS X.
- My primary editor is Sublime Text.
- My production servers are provided mostly by Heroku.
- All my sites are hosted on Amazon EC2.
I've got nothing against Apple, Heroku, or Amazon, but their tools are not open source.
And that's food for thought.