The XDA Recognized Developer bigfau’s own Split View for the LG G2 seems to be stable and running without any major issues. There are a few compatibility problems with certain apps though, such as Tapatalk and Hangouts.
You install it by downloading a zip file and flashing it through a custom recovery. No info on why we can’t just install an APK file though? Doesn’t that work with this feature? Bigfau also provided a flashable zip file to remove Split View if you want to do that. This Split View should work with different LG G2 versions like, D800, D802, VS980, LS980, D805D801V11B Videotron, and the D802.
You have to be rooted and having G2 Xposed (the LG G2 app for Xposed) installed though.