Free eBooks on JS, etc.
You'll need to create a "premium" account but a disposable email works fine...no credit card or anything. You don't even need to confirm your email.
The books are big - the ones I glanced through are 250-400 pages, with pretty nice design and typesetting. But I haven't read them yet so if they're garbage, well, they were free.
Naturally they want to sell you their premium books and courses, but these 10 are completely free and available in a variety of downloadable formats (pdf, mobi, epub).
Now go write a WHMCS replacement!
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