Dhawal Shah, founder of Class Central compiled this list of over 515 such free online courses that you can start this month. For this, he leveraged Class Central’s database of over 7,000 courses.  https://medium.freecodecamp.com/515-free-online-programming-computer-science-courses-you-can-start-in-april-8b0ce1817d61

Class-central’s landing page.

These courses are sorted based on their difficulty level:

• Beginner
• Intermediate
• Advanced

Many of these courses are completely self-paced. The rest will start at various times later this month. You can find complete lists of the technology-related courses starting later in 2017 on our Computer Science and Programming subject pages.