We make our website with a very simple CMS. This tool automatically creates all files we need and we only need to add a title in the list on the left and enter the text and a few HTML tags.
Recently, we needed a way to quickly find stray tags. We added a command line utility to validate the HTML code and a brief script that highlights in yellow all the HTML code that appears within one pair of tags. This is also useful to debug HTML code of other projects and thus we made a separate HTML editor with the same validating and highlighting features. Everything was scripted in LiveCode.