CherryTree, Nuclino, Hydrus, TagSpaces, Notesnook, Trilium Notes, Evernote Web Clipper, Paperwork, Org mode, Tagstoo, StorURL, Tabbles, Knowfox, TaggedFrog, Nimbus Note, QOwnNotes, Tagger, Cryptee, Elyse, tag2find, Taglists, allTags, Punakea, TaggTool, Knowte, TagFlow, File Name Tag Explorer, TMSU, TagsForAll, DiviFile, Synapbook, Umbrella Note, TagLauncher, miTaggedMarks, Tagz, confidential.tech, Agenda Mahala, Taggit, Pipy, TagoMan, SmartNotes are some alternatives to Keepmark.