GuidePost
Here’s a blast from the past. I finally dug out a GuidePost installer from years ago because I was being nagged about it, so here you are Z: GuidePost 0.6a.
For the curious, GuidePost is a simple text-based editor for GuideML, the XML application used for h2g2 articles, and other DNA-powered sites on bbc.co.uk. I wrote it many years ago and haven’t touched it since, largely because it’s a Windows app and I don’t do those anymore. I do keep meaning to do a Mac version, but haven’t found the time yet.