A free open-source Recycler UI tool, available on Github (and shortly, the Unity Asset store).
Each company I worked for had their own recycler that was always lacking in some functionality. It is difficult to allocate a lot of time to perfect a single UI element. This led to my solution, which is currently being used in my other projects.
Full videos and complete documentation can be found on my Github: https://github.com/surmwill/recycler_unity