patcher9x - all-in-one patch for numerous issues that prevent 9x from being used on newer computers, including in VMs.

98SE2ME by mdgx - install some components from Windows Me into 98SE

Reddit thread that mentions a lot of enhancements/modifications: 98lite, Unofficial 98 Service Pack 3.66, 98SE2ME, KernelEx, and Revolutions Pack 9. SP3 gets an entirely opposite opinion compared to another thread, though.