minipad2 is described as 'integrates many useful functions into one program including notepad, calculator, reminder, dictionary, launcher, address list, text template, and clipboard enhancement' and is an app in the Office & Productivity category. There are more than 100 alternatives to minipad2 for a variety of platforms, including Windows, Mac, Android, Linux and Online / Web-based. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or Microsoft OneNote. Other great apps like minipad2 are Evernote (Freemium), Simplenote (Free, Open Source), CherryTree (Free, Open Source) and NoteLedge (Paid).
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.