Windows/Linux: Re-installing your favourite software in a new system takes time — boring, click-to-proceed time you could spend more wisely. Ninite, the web-based installer that takes the nag out of installs, now offers great custom packages for Ubuntu Linux.
If you're running Ubuntu, head to Ninite's site, check the apps you want on your system, then click "Get Installer". The .deb file you get in return installs everything and handles the addition of third-party repositories for apps like GNOME-Do and Dropbox. The DEB packages may install on other Debian-based distributions, but they appear designed for Ubuntu systems.