MJML

Pretty darn good, though could use some work here and there. Having the developer tools is great, but not having builtin documentation is a setback—or did I simply miss it? One of the included templates loads with a syntax error (the code seems to work though, so the error may be in error). The project gallery is very nice and has a set of templates that cover a lot of use cases. I loaded up several templates from the gallery with no syntax errors. I wish the switching between platforms was done with buttons on the toolbar instead of an invisible button that appears only when one mouses as far away from the toolbar as is possible within the GUI. Dragging the window thumb to change the size works too, and is a better way of switching than buttons at the bottom of the screen, but still "mousier" than it ought to be. There is no obvious way to customize the syntax coloring; the comment tags are impossible to read. While there is a high-contrast mode, it has very limited syntax coloring (two colors only). The project browsing and file browsing within projects work well.