Balabolka is older program for turning any book for audiobook. Several ebook reader software also offer read aloud feature.
Several good sounding AI options are currently behind paywalls. Text to speech tech is going forward with great speech, but public offerings are currently limited.
For pirating audiobooks I first try Mobilism. Second option is searching for a streaming site with duckduckgo ( audiobook + book name), If that does not lead to results then it time to torrent from audiobookbay