Eaglecraft X -

This is the million-dollar question. Because Eaglecraft X is a closed-source, cracked launcher developed by an anonymous Russian team (often traced back to the "EagleDev" group), security concerns are valid.

The Evolution of Browser-Based Gaming: Eaglercraft X Eaglercraft X Eaglercraft 1.8 Eaglecraft X

However, following DMCA takedown requests from Microsoft/Mojang. This is the million-dollar question