1. Codecademy:
offers a comprehensive and interactive way to learn programming languages like Python, Java, and C++. ​It features tutorials, coding challenges, and exercises that help students improve their coding skills.

2. SoloLearn:
provides bite-sized lessons on various programming languages, including HTML, CSS, and JavaScript. It also features quizzes and challenges to test your knowledge.

3. Evernote:
is a great all-purpose note-taking app that can be used to capture ideas, organize research, and create study guides. It can also be used to store code snippets, website links, and other IT-related resources.

4. Udacity:
offers both free and paid courses on a variety of tech skills, including programming, data science, and cloud computing. Their free courses are a great way to get started with a new subject or to supplement your learning in a particular area.

5. Khan Academy:
is a great resource for learning the fundamentals of computer science and programming. They offer video tutorials, practice exercises, and a personalized learning experience that adapts to your pace.