For me it is a convenient and compact tool in which I can put all my ideas, goals, thoughts
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Mimo - Learn how to code on your iPhone📱
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Quick Code - Curated list of free online programming courses
Joplin - 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, tagged and modified either from the applications directly or from your own text editor.
Enlight - Performance and Error Monitoring. We keep an eye on your applications and notify you about performance issues and errors.