Again, this corporate form is trying to force me to choose from products with slightly different names while not offering common options.
Udemy seems similar in many respects, but my recollection is that their subscription model was less appealing. I didn't find they offered much that Lynda.com didn't. Sitting through online instruction is time-consuming, and I didn't want to subscribe to an additional service. I may reconsider now, however, since LinkedIn's take-over. They seem to be most similar to Lynda.com. Others are really offering alternatives to university enrollment-based degree pursuing classes.
Coursera is more of a long-term instructional system. Many of their instructors are academic "celebrities" in their fields, however you only interact with a video of them, a TA, and other classmates. The project feedback from other classmates wasn't helpful, and in some cases was out-right insulting. They seem to be moving away from some of their free courses to suites of paid courses with project certificates, though often with a free non-certificate option as well. Many of the class videos can also be found on YouTube. A big drawback of most of these classes is that they're offered only at certain times, so you may have to wait months for a class to start. The Introduction to Human Computer Interaction class I took with a Stanford/UCSD professor had 4000 students in it! Those lessons had all been on the instructors faculty page as well, and are still available on YouTube, but the class projects were what made it worthwhile.
Kadenze if offering a selection of arts-related software and business courses. They have some of the top names in these fields. The class model is nearly identical to
Coursera, and suffers some of the same drawbacks.
These shortcomings aren't so much due to the company offering the courses, however; many universities are now offering their classes using the same software that they both use. A friend was extremely upset after moving across the country for a graduate program, only to discover the entire class was being delivered online (before the pandemic) in pretty much the same fashion as
Coursera, though with a much smaller class-size.
YouTube offers a huge variety of software training videos, but there's no vetting system, and the quality varies from exceptional to unwatchable. It's often great for tracking down an answer to software dysfunctionality though. I just watched Lynda.com's SketchUp Essentials, and had some un-explained questions that I found answers to immediately on YouTube - not on the software manufacturer's site, however!
MIT has a vast treasure trove of it's classes and syllabi available for free online. These don't include videos of the instructor lectures, however.
Community College certificate programs and classes have been a better option for me, when I just wanted to learn an application.