sublib-1.10.2-1.1.3.0.jar is a release file of the Minecraft data pack Elytra Contrails, made for Minecraft 1.10.2. It was published on November 22, 2016 and is 0 MB in size. For the full description, screenshots and every other version, visit the Elytra Contrails data pack page.
How to install: Put the .zip into the datapacks folder of your world (.minecraft/saves/<world>/datapacks) and run /reload. No mods needed.