Chunk borders is probably the reason that most of you have come here if the statistics are anything to go by. This is a pack that generates a chunk border similar to java. It can be disabled in game and that is pretty cool. The chunk borders are player bound and do require modification of the player. That means that things like custom skins in minecraft market will break when using these packs.
One fun thing is if someone else has a rocket in the off hand you can see their bounding box flying around.
Released version:
https://github.com/RavinMaddHatter/Bedrock-Chunk-Boarders-Pack/releases/tag/1.0.1
Source code:
https://github.com/RavinMaddHatter/Bedrock-Chunk-Boarders-Pack