JSR is described as 'Open-source registry for modern JavaScript, natively supporting TypeScript with cross-runtime modules that integrate seamlessly into existing setups' and is a Package Manager in the development category. There are more than 25 alternatives to JSR, not only websites but also apps for a variety of platforms, including Linux, Mac, Windows and Self-Hosted apps. The best JSR alternative is npm, which is both free and Open Source. Other great sites and apps similar to JSR are Bun, Advanced Package Tool (APT), Nix Package Manager and PyPI.