Lucidchart, Xmind, FreeMind, MindNode, MindManager , TheBrain, MindMeister, Freeplane, Obsidian Canvas, Mind Mapping 3D, Scapple, Coggle, iThoughts, ProcessMaker, GroupMap, Linked Ideas, Inspiration, mindmaps.app, Minzel, Mindmup, TreeSheets, Wondershare EdrawMind, text2mindmap, WiseMapping, Taskheat, Calligra Braindump, Corkulous, LexiCan, Throughline, Thortspace, Mind Maps Pro, miMind by CryptoBees LLC, Argumentative, Xebece, Bookvar, MindIt, Mind On Track, Mapul, Cubetto Flow, Memofon, PsiPlore, eMindMaps are some alternatives to SimpleMind.