What Tool Do You Wish Was Open Source?

Open Source has been rising in popularity and open source alternatives have been heavily competing with enterprise solution. Open source solutions provide developers with so much flexibility to create amazing projects, and encourages building strong communities.

Medusa is one of the open source solutions that gives developers and merchants alike full control over their tech stack when building their ecommerce stores. Medusa's customization and extendable features and capabilities makes it a strong alternative for enterprise solutions like Shopify.

What tools do you wish were open source? And how do you think the community would benefit from making such tools open source?