FreeMind was the app that brought me to digital mind mapping. Back when I was studying and didn’t have any money this was the best app to get. It has been in beta for years, literally. Over the most recent weeks releases have indicated that 1.0 was nearing.
I still recommend FreeMind to new mind mappers. It is free and it has quite a lot of features. Including many of those that people want from Mac-native apps like MindNode and others, including comments and icons for nodes.
I’d recommend to give FreeMind 1.0 a whirl again and to keep using it if you are fine with running a Java app.