The most famous and oldest OCW contributor MIT comes up with a program MITx, through which it will provide a certificate of course completion after assessing the learning. This is not completely free, but at an affordable price, course ware is free as usual.
Currently MIT has 2100+ courses and more than 100 million people access the course ware. Some of these courses will be offered though an online interactive platform where
students can learn at their own pace,provides interactive and online lab facilities,Assessment of students work and providing a certificate of completion by MITx
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