MyTetra is described as 'Is open source and cross platform personal manager for information accumulation. It is powerful program for data memorization and structuring notes' and is a Note-taking tool in the office & productivity category. There are more than 100 alternatives to MyTetra for a variety of platforms, including Windows, Mac, Linux, Android and Web-based apps. The best MyTetra alternative is Notesnook, which is both free and Open Source. Other great apps like MyTetra are Zim, CherryTree, TiddlyWiki and Trilium Notes.
NotesHolder lets you quickly type in any piece of information so that you can easily find it when you need, read it or print it out for your convenience. This is the most effective way to store all your notes without cluttering up your desk with post it notes / sticky notes.
Russia
Simple but incredibly useful, Leafnote is a minimal text editor with a twist: the ability to keep multiple documents together as a single project, organized in an easy-to-rearrange tree.
United States
A beautiful, fast, and simple note taking app in the style of elementary OS
Incollector is an application to collect various kinds of information (like notes, conversation logs, quotes, serial numbers, source code, web addresses, words). All the entries can be tagged, so you can find them very easily.
Built-in quick note: save ideas, contacts, interesting facts
With Exstora, you can write down a thought that comes to your mind as soon as possible. To create a new note, just double-click next to the corresponding section.
Personal organizer software: plans for the future, eve.
Slovakia
EU
This simple productivity app allows you to log all of the tasks you need to complete for the day within Notification Center.
NoteFrog is a masterfully designed Personal Information Manager offering the industry's fastest access and retreival of free-form information.
PIM software, personal information manager, open source, cross-platform, organizer, address book, appointment, calendar, diary
taskpaper+ is a portable browser-based todo program (i.e. it runs in a web browser; however it doesnt need an internet connection--it has its own local webserver). Under the skin your precious task lists are saved in plain text files written in a clear, logical way.
Autofocus System is a simple yet effective time management system. It was developed by Mark Forster.
MemoPad is software that comes with your Blackberry: it allows you to make notes, but not edit files.
KNote is an easy to use wiki-like note taking program with built in file management and blogging capabilities.
