Catalog with popular software and their free or open source alternatives. Visitors can filter alternatives by license and operating system.

Lists best open source products and libraries.

A directory of open source software focused on Java.

A catalog of GNU/Linux programs, which can be browsed or searched.

A guide to open source software for the Windows platform. Lists most popular downloads and offers a review of each product.

Lists open source projects that could be essential to NASA missions.

A categorized list of open source C#, VB.NET, ASP.Net projects.

Open source alternatives to commercial software.

A complete list of open source help desk software packages.

Offers a directory dedicated to enterprise grade open source solutions.

A directory of the web's best open source software.

Directory of scripts in various languages from Unix Shells to Visual Basic.

Provides a list of open source software organized by categories.

Directory of open source software focused in C#.

Open source solutions that can be used as alternatives to commercial software.

Website publishing reviews of free and open source software.