https://freecourses.github.io/
Freecourses is a platform which offers a collection of free course links for various development languages and frameworks. You will find every course which is listed here is either free or trial version for learning. So enjoy the content.
You can also contribute to the project. Check below different ways for contributions please check in CONTRIBUTING.md
You can add more courses to the project by filling out the form
Link: https://goo.gl/forms/S3AJKJlYPj9MqQj93
For contribution please check CONTRIBUTING.md