NowDo, Zanshin, Calcurse, iMDone, todotxt.net, Getting Things GNOME, Tasktop, Pi Reminder, Simpletask Cloudless, TodoListMe, DoItRight, Nibras PKM, Five.Today, QTodoTxt 2, topydo, Tudumo, DoTimely Hub, Todo.EXE, dstask, Gnome To Do, MyMaelstrom, Yokadi, NoProb To-Do List, Alinof ToDoList, DevTodo, GTD Simple, ReminderFox, jdotxt, Domestica, Quicktask (Vim plugin), Mirakel, Effitask, SwiftoDo, Got to Do are some alternatives to Todo.txt.