Elephant is described as 'notetaker with a classic interface you already know. Keep your notes to yourself. No accounts or clouds. For syncing use Dropbox, Github, rsync, ... No feature bloat or redesigns, ever' and is an app in the Office & Productivity category. There are more than 100 alternatives to Elephant for a variety of platforms, including Windows, Mac, Android, iPhone and Linux. The best alternative is Joplin, which is both free and Open Source. Other great apps like Elephant are Standard Notes (Freemium, Open Source), Google Keep (Free), Microsoft OneNote (Freemium) and Evernote (Freemium).
Jarnal is an open-source application for notetaking, sketching, keeping a journal, making a presentation, annotating a document - including pdf - or collaborating using a stylus, mouse or keyboard. It is similar to Microsoft .
Redefining the way programming notes are taken. Text editors are too one dimensional, Evernote/Onenote is too generic. Medley Text is a note taking tool designed to help you take pretty and organized programming notes.
MemoMaster is a free outliner software to create, administer and reference texts and calculations in the familiar tree structure. It enables intuitive searching, browsing, and organization of information.
Flashnote is a quick notes manager created for such cases. When you need a rough copy to save or to process some pieces of a text, Flashnote is small, quick and convenient. Press the shortcut-key combination and a rough copy is on the screen in a flash of a second.