The Free Software Foundation fights for freedom in computing. Among other the 4 software freedoms all free software adheres to:

• The freedom to run the program as you wish, for any purpose (freedom 0).
• The freedom to study how the program works, and change it so it does your computing as you wish (freedom 1). Access to the source code is a precondition for this.
• The freedom to redistribute copies so you can help others (freedom 2).
• The freedom to distribute copies of your modified versions to others (freedom 3). By doing this you can give the whole community a chance to benefit from your changes. Access to the source code is a precondition for this.

The FSF fights for what i personally would consider anarchist principles as they fight proprietary software that abuses the user and denies them freedom on their own computer.

They also recommend these Operation Systems that recommend user’s freedoms:

https://www.gnu.org/distros/free-distros.html

This gives you full control over your computer instead of putting you at the mercy of companies or governments. Very important I would assume for a lot of anarchists.