wikidPad is described as 'Wiki-like notebook for storing your thoughts, ideas, todo lists, contacts, or anything else you can think of to write down. What makes wikidPad different from other notepad applications is the ease with which you can cross-link your information' and is a well-known app in the Office & Productivity category. There are more than 100 alternatives to wikidPad for a variety of platforms, including Windows, Mac, Linux, Android and Online / Web-based. The best alternative is Joplin, which is both free and Open Source. Other great apps like wikidPad are Standard Notes (Freemium, Open Source), Google Keep (Free), Microsoft OneNote (Freemium) and Obsidian (Free Personal).
Notational Velocity is a mouseless application for storing and retrieving notes. With Notational Velocity, searching for notes is not a separate action; rather, it is the primary interface. Searching encompasses all notes content and occurs instantly with each key pressed.
NixNote, formerly Nevernote, is an open source client for Evernote . It is written in Java so it will also run on Windows & OS-X, but the primary focus has been to try and get a usable environment for Linux.
AllMyNotes Organizer is a multi-functional hierarchical information manager for Windows. Store all your Notes in virtual folders in one file! Everyone is unique so AllMyNotes Organizer offers freedom of individualizing your notes in totally customizable tree structure.
WizNote is a Note software, which is especially designed for Internet users and mobile Internet users. WizNote focuses more on notes of rapid collection, management, reading and sharing. WizNote is smaller, more stable, and more suitable for computers, phones and mobile devices.
myBase is a unique free-form database software that allows entry of unstructured text, webpages, images, documents, emails and even arbitrary files without regard to length or format. All information is automatically compressed and stored in the tree structured outline form.