What are some other websites/resources like this? That is, ones that make a text easier to read, either with parallel translation or word lookup etc?

Listing the ones I know (in no particular order, just a list I had collected a while ago):

- Physical (print) books: Loeb Classical Library (Greek and Latin) https://www.loebclassics.com/, Clay Sanskrit Library (Sanskrit) http://www.claysanskritlibrary.org/volumes_current.php, Murty Classical Library of India (various languages) https://murtylibrary.com/volumes.php.

- Perseus Hopper (Greek and Latin), https://www.perseus.tufts.edu/hopper/

- Chinese Text Project (https://ctext.org/)

- https://nodictionaries.com/ (Latin)

- http://pseudw.herokuapp.com/iliad/books/1?start=500&end=589&... = https://github.com/nkallen/pseudw/ (Greek: The Iliad)

- http://alpheios.net/ (Latin, Greek)

- quran.com / legacy.quran.com / corpus.quran.com (The Quran: Arabic)

- Dickinson College Commentaries (Latin) e.g. https://dcc.dickinson.edu/tacitus-agricola/1

- "e-readers" under http://sanskrit.uohyd.ac.in/scl/ (Sanskrit)

- Gita Supersite (Sanskrit) e.g. https://www.gitasupersite.iitk.ac.in/srimad?language=dv&fiel...

- https://greenmesg.org/stotras/lakshmi/sri_suktam.php etc (Sanskrit)

- No Fear Shakespeare (https://www.sparknotes.com/shakespeare/)

- https://github.com/tasuki/side-by-side e.g. https://enchiridion.tasuki.org https://ttc.tasuki.org/

- This one (https://aquinas.cc/la/en/~ST.I.Pr.3)

Of these, http://alpheios.net/ and https://github.com/tasuki/side-by-side are ones that allow you to build your own webpages / present your own texts. Are there more?