This site was created because the OG site didn’t have SSL and the original site goes down often.
For those of you who don’t know the site it is an impressive archive of Marxist works from Marx to Mao based on the translations published in USSR and Chinese publishing houses.
Onion link: http://gndqrlzytvhexjqxhp2emk4cdvh7cxqjugu5cmavpc4czezthjesclyd.onion/
this is the one I use now after trying out a bunch from fdroid.
If you’re someone like me with reading issues, this app is very good because you have a TTS function and you can load your custom fonts for free. And no ads. Too much for someone who only needs to open some PDFs though.