We've released a series of z88dk demo's for the ZX Spectrum Next. These are designed to complement Stefan Bylund's great series of examples.
Chess Demo
Demonstrates relative sprites for the ZX Spectrum Next.
https://www.baker76.com/zxnext-chess/
Tilemap Demo
Tilemap demo for the ZX Spectrum Next.
https://www.baker76.com/zxnext-tilemap/
Layer2 Tilemap Demo
Example using Layer2 tilemap rendering for the ZX Spectrum Next.
https://www.baker76.com/zxnext-layer2-tilemap/
SFX Demo
Sound effects demo for the ZX Spectrum Next.
https://www.baker76.com/zxnext-sfx/
Dual VT Sound Demo
Example showing dual Vortex Tracker II player for the ZX Spectrum Next.
https://www.baker76.com/zxnext-dual-vt-sound/
DMA Sample Demo
Based on David Saphier (em00k's) Multi Sample Engine in z80 for the ZX Spectrum Next.
https://www.baker76.com/zxnext-dma-sample/