So we don't get in trouble for taking other threads off topic, how about we start listing alternatives to Windows programs here? Keep it to ones you have personal experience with. Most of them will be prepackaged for Linux distributions, other *nix may need to build from source.
GnuCash ( gnucash.org ) I've used this for a while, it's gotten better every version. It will import Quicken data files, has interfaces to online banking. It'll work fine for small business too.
LibreOffice. I've used this since it was StarOffice, another that has gotten better and better. Biggest issue is always compatibility with Office file formats, but simply save in a "not the latest" Office and you should be fine.
Thunderbird. Now has the Lightening calendar bit integrated (you can pick up Google calendar with it, probably other calendar formats), does a good job of email too.
Lightzone ( google for lightzone project to find the website )
Video Conferencing/Video Calls:
Google Hangouts ( there is a plugin that works on Firefox )
What else do we have?
Edited by mremski, 21 March 2016 - 05:51 AM.