Hi! I have used ”Inspiration” (now v. 10 for Windows) for such purposes For many years. It is not free, but quite cheap and very versatile and useful. You can very easily draw concept maps in different designs, and lot of symbols are also included. When you have developed a concet mindmap you can convert it into a disposition with titles and subtitles and bringit into Word. It is also possible to produce mindmaps in linked layers, to link concepts to URLs, text- video- and sound files om your computer - and turn it all into publishable html pages (or pdfs, gifs, word, etc).