Recently discovered Sioyek via @BrodieOnLinux It's a pdf reader specialised for academic and technical documents. I especially like the feature that lets you keep figures in a pane while scrolling through the rest of the doc. Plus the lead dev was super responsive when I opened a small feature request on github they implemented it same day!

Scholar Social

Scholar Social is a microblogging platform for researchers, grad students, librarians, archivists, undergrads, academically inclined high schoolers, educators of all levels, journal editors, research assistants, professors, administrators—anyone involved in academia who is willing to engage with others respectfully.