I find modern philosophy papers to be far more interesting, readable and concise than some of these texts, which are often pretty circuitous. Unfortunately, I haven't yet found a good site that curates good papers.
It's an annual collection of some of the best papers of the year. It's not aimed at the general reader so some of these will be impenetrable if you don't have a background in the specific area, but there's usually a couple of readable things in each year's edition for someone with an ~undergrad level foundation.
For example, here's the article on Marx: https://plato.stanford.edu/entries/marx/
A friend who is pursuing a BA in Philosophy says it's the only online source that they are allowed to cite.