I personally use notepad++

We use Sublimetext and Sourcetree

Thanks Mark & Ken. I've been using Notepad++ but looking for more like debugging, refactoring, and code completion for App development. I must say I really like Sublime Text and the price of Sourcetree (unlimited public/private repositories). For IDE I tried out Eclipse, Techjoomla recommends for re-building custom mobile apps but I've also just setup PhpStorm based on what I've found on the web. It's all alot different than the VisualStudio world, that's for sure

For anyone interested, I found some other useful sources of info as well if you're moving to Joomla-PHP from other domains:

• Comparison of text editors
  
• Comparison of IDE's
  
• Best PHP IDE 2014 Survey Results by sitepoint
  
• Found out most of the developers at my preferred template provider RocketTheme use Sublime Text as well (even as I'm aware of the many reasons to avoid templates that use heavy frameworks).
  

After some work I've got a setup working fairly well, feeling "good & calm" for PhpStorm. Anyone who's also interested Joomla has details for Eclipse, here's tips on PhpStorm setup (fyi Joomla has a gratis license and anyone who can establish active work on an Open project can get one as well):

• Using an IDE for Joomla Development
  
• Joomla & PhpStorm Best Practice Tips
  
• Configuration tip: Supporting 1 codebase, multiple Apps/Extensions against different Joomla versions
  
• "zero configuration" debugging
  
• Quick Joomla debug video
  
• "Ultimate Guide" to what you can do debugging PHP/Javascript with PhpStorm --- can actually have simultaneous windows
  

Thanks for sharing this Eileen