PC World: 22 awesome open source programs that do everything you need. “Good software is the basis of all PC use, but many professional programs are too expensive for private use. This is where the free software-based applications step in, which, including their source code, are available free of charge on the internet. This immediately raises the question of quality and functionality. Don’t worry, open source software is often a real competitor to professional products. In this guide, we present the best open source tools for typical areas of application — from Office, to media editing, to file management and backup.”