There are also a great many open source software projects that have daily use among many, many people worldwide.
7-Zip, for example, is a robust and lightweight compression and decompression tool which handles a variety of formats, integrates into context menus, and comes with a seamless, unobtrusive interface.
VLC player, for another, is a quality multimedia player with a tiny footprint that almost betrays the rich array of video and audio formats it can handle.
If you are an avid e-book reader you will undoubtedly have used Calibre, a terrific tool for organising your e-book collection and converting between formats with minimal fuss.
KeePassX stores your credentials for web sites and applications, in an encrypted and safe fashion. Use this app and you can have individual passwords for every site you use, never again fearing that if one site is breached that you are compromised on other sites.
Other popular apps you might use are FileZilla, TOR, the GIMP, Firefox, qTorrent, Blender - even Apache, TrueCrypt, LibreOffice, PostgreSQL and more.
How much would you pay for quality software? What is the benefit or value you have derived from the use of such applications as these?
Visit the web site for your favourite FOSS apps and search for a donation link. You may find you can use PayPal or BitCoins as well as more traditional payment models.
Alternatively, try starting your next Amazon.Com session at smile.amazon.com - this will cause a small percentage of your normal purchase price to be directed to a charitable organisation of your choice, which includes GNOME, the EFF and others.
Give it a thought; set 2014 off on a charitable tack, with a spirit of returning to those who have you given to you.