Xmind, FreeMind, MindNode, MindManager , Miro, TheBrain, MindMeister, Freeplane, Mind Mapping 3D, Coggle, Kumu, AFFiNE, Popplet, GitMind, IdeaClouds, Wondershare EdrawMind, Infinity Maps, semantik, DeepNotes, Plectica, Mindmapp, Bookvar, Knowflow, InsightNG, Breakdown Notes, Zen Mind Map, Mapul, Stormz, Wikicontext, MindPicto are some alternatives to IOctopus.