For Java or Scala I use an IDE. Currently Eclipse but I'm giving IntelliJ an honest shot at the moment. I find that Java requires an IDE for me to be productive

For Java or Scala I use an IDE. Currently Eclipse but I'm giving IntelliJ an honest shot at the moment. I find that Java requires an IDE for me to be productive, even though I used emacs back in the Java 1.0 days. For C and Python I use emacs. I'm more comfortable with emacs here as decent documentation can be had from the command line (man and pydoc) so have never spent the time trying them in an IDE. An average day for me involves Java, C and Python. So I flip back and forth between an IDE and emacs and feel that I'm using the best tool for the job in each case.