I regularly make 3d rides for NL2 and provide them to the community to use in their creations, so this thread post will be updated whenever there is a new release. Hope you guys enjoy.
All rides can be downloaded from: http://www.nolimits2advanced.com/downloads/custom-attractions/
If you need help installing them into NL2, then follow this guide and it should get you on your way: http://www.nolimits2advanced.com/547/installing-sets-from-nl2a/
In addition to what is provided by NL2A, Peak Amusments also contributes to the website with Texture packs and parks, which can be downloaded both on the NL2A site and Coaster Crazy.
NL2A: http://www.nolimits2advanced.com/downloads/coaster-textures/
Coaster Crazy: https://www.coastercrazy.com/exchange/alluploads.php?auts=32220
EDIT: Thread updated with latest NL2A Releases.