There are many alternatives to Windows 98 for Windows and since it's discontinued a lot of people are looking for a replacement. The best Windows alternative is Debian, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Windows 98 and four of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Windows 98 are Windows 10, ReactOS and Damn Small Linux.
The Debian Project is an association of individuals who have made common cause to create a free operating system. This operating system that we have created is called Debian.
Versatile OS with universal app architecture, free first-year offer for Windows 7 and 8.1 users, redesigned mouse-touch UI, virtual desktop, Microsoft Edge, upgraded security, and enhanced graphics for gaming, supporting fingerprint and face recognition login.
ReactOS™ is a FOSS effort to develop a quality operating system based on the architecture of Microsoft® Windows™ NT family of operating systems, that is compatible with applications and drivers written for it (NT4, 2000, XP, 2003, Vista, 7).
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As ReactOS is still in alpha stage and not suitable for everyday use, it is not very good alternative. But if you have some legacy (maybe customized or abandoned) software / game that require Windows 98, you should try React OS - it may work well and you will run your software in modern, supported OS.