There are many alternatives to DoISO for Windows and since it's discontinued a lot of people are looking for a replacement. The best open source Windows alternative is InfraRecorder. If that doesn't work for you, our users have ranked more than 25 alternatives to DoISO, but unfortunately only two of them are open source and available for Windows. If you can't find an alternative you can try to remove all filters.
InfraRecorder is a free CD/DVD burning solution for Microsoft Windows. It offers a wide range of powerful features; all through an easy to use application interface and Windows Explorer integration.
IsoCreator (could also be called Folder-to-ISO or Directory-to-ISO) C#.NET 2.0 application which creates ISO 9660 Joliet CD images from a given folder or volume. Can also create ISO with virtual files, given a tree representing a directory structure.
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It's more of an alternative to Nero but it handles ISO just fine. Being updated or not should NOT be a criterion. It works flawlessly on nearly all Windows platforms and does what it is supposed to do. Source code is available.