arxiv.org I have a whole list of open Access journals
<a href="https://www.intechopen.com/" rel="nofollow">https://www.intechopen.com/</a>
<a href="http://freecomputerbooks.com/" rel="nofollow">http://freecomputerbooks.com/</a>
<a href="https://www.onlineprogrammingbooks.com/open-source/" rel="nofollow">https://www.onlineprogrammingbooks.com/open-source/</a><p>and a bunch more