I can’t recommended Tachiyomi enough. You can download any translated manga/manhwa/webtoon (on multiple languages too!) you want, since you gather them from different sources and websites available inside the app. There’s also a fork called Tachidesk that lets you perfectly read and download mangas on the PC.

But I yet have to find any full-blown officially translated volumes as PDF/EPUB pirate websites.

Zlib can give you some lightnovels and manga, their onion website is still up and the app for android is working again