Alternatively, do any larger corpora have categories that pertain to technology, computer science, etc.? Or collections of English documentation and/or manuals related to modern devices, interfaces, technology products, etc.?
Ironically, your best bet is: https://archive.org/download/stackexchange
Yes, there are such corpora. One freely availble corpus is IULA Spanish-English Technical Corpus from Universitat Pompeu Fabra.
Another one, concentrating on Computational Linguistcs, is the ACL anthology