Regarding Web browsers (on 2018 and mainly FOSS)

webbrowsers are the new OS!

 

Firefox engine

https://ftp.mozilla.org/pub/firefox/releases/

   Firefox Developer Edition (beta version and its own profile folder)
   Waterfox 61 (Compatible with XUL legacy addons and webextensions)
   Basilisk 201804 (updated and based in FF52, targeting v55)
   Palemoon 27.x (based in pre Australis UI interface, compatible with old-legacy addons v27


for Android
  www.apkmirror.com

   Waterfox 55.2 (compatible with bb10 Android runtime, support for addons)
   html5test: 477/555
   Waterfox 56.1 (NOT compatible with bb10 Android runtime)
   Fennec F-droid 60 (proprietary parts removed from FF code)

 Webkit

for Android
Mercury (compatible with bb10 Android 4.3 runtime, super light weight, predefined useragents)
v 3.2.3 html5test: 201/555

Lightning (compatible with bb10 Android 4.3 runtime, super light weight, predefined useragents)
html5test: 201/555

 Chromium

for Android
yubrowser optimized for Snapdragon cpu (compatible with bb10 Android 4.3 runtime, too heavy, predefined useragents)
html5test: 500/555

BEOL (bb en of life) super lightweight based in cordova (compatible with bb10 Android 4.3 runtime, early beta and ultra-minimalistic)
identified as a Crosswalk webview/Chrome 53
html5test: 498/555