I often come across situations where I need to download a full installer of some piece of software without having to jump through hoops. Skype is a prime example. Often times, I want to download the latest installer without having to sign into any particular Skype account, except that Skype wants me to sign-in to my Skype account before they allow me to download. Usually, I'm trying to reinstall the software without having to provide any credentials, or I'm trying to update an OS image.
Fortunately, I found the link to download Skype for Windows version:
http://www.skype.com/en/download-skype/skype-for-windows/
Here's Skype for Mac:
http://www.skype.com/en/download-skype/skype-for-mac/
Note: It seems that the links above will base the download on what platform you are downloading from. For example, if you are downloading from a Windows machine, both the Windows link & the Mac link above will download an .exe file.
Another piece of software I frequently need is Adobe Flash. In this case, I generally need a full version rather than the stub you get when you go through the visible links on the main Adobe site. Here's the Adobe Flash download link:
http://www.adobe.com/products/flashplayer/distribution3.html
Will add more as I find them.
2014_02_18 Update: Here's the Google Chrome Full Offline Installer that will install Chrome for all users on Windows:
http://www.google.com/chrome/eula.html?system=true&standalone=1
Didn't see one for Mac.
2014_10_04 Update: Here's the free Mac Sophos Anti-Virus installer:
http://downloads.sophos.com/home-edition/savosx_90_he.zip