Text editors are vim most of the time, and TextWrangler or Notepad++ if I decide I want a GUI. My compilers are gcc and clang.
I use Firefox and Safari as web browsers, also have Opera and IE11 for testing against other rendering engines. I'm still using ageing Apple Mail, iCal and Address Book. I don't like their new versions in the later OS X versions.
I use GNU Lilypond for typesetting music. I occasionally use GarageBand for basic sequencing and mixing, but nothing particularly serious.
I use Adobe Lightroom for processing my photos, and I wouldn't want to be without it. I have Photoshop as well but I barely use it.
My web/mail server runs CentOS 7 with Apache, dovecot, postfix, Horde and MySQL.
I don't actually use much more software than that. I occasionally fire up Visual Studio to look for bugs using iterator debugging. Oh I have VLC and Quicktime for media, and Steam for games, but I don't play with them very often.