CherryTree, TiddlyWiki, KeepNote, Notesnook, Trilium Notes, TreeDBNotes, Heynote, wikidPad, Nimbus Note, Tomboy, GNotes, Turtl, Cryptee, Notally, Notes by Firefox, nimblenote, Simple Notes, Notekeeper, Zoot XT, AHOY!, Tomdroid, vijazedan simple notes, Notenik, Bananote, NotesSync, Catch Notes, colocolomemo, OpenNote, Springpad are some alternatives to Omni Notes.