This:

• PostmarketOS is up and running with support for hardware acceleration.
• A port of LuneOS is under development. It’s an open source operating system based on weBOS.
• SailfishOS is at least booting.
• Another developer is working on porting Nemo Mobile with the Glacier UI.
• Here’s an image showing the Sway tiling Wayland compositor.
• And here’s a video showing Maemo Leste on the PinePhone dev kit (without hardware acceleration).

. . . and this . . .

• 5.95 inch, 1440 x 720 pixel LCD display
• Allwinner A64 quad-core ARM Cortex-A53 processor
• Mali 400 MP2 graphics
• 2GB RAM
• 16GB eMMC storage
• Bootable microSD card
• USB-C
• 5MP rear and 2MP front cameras
• 4G LTE Cat 4 modem
• 802.11b/g/n WiFi
• Bluetooth 4.0
• GPS/GLONASS
• 3,000 mAh battery

. . . combined would mean I could boot whatever I need at the time -- or just want to screw around with -- without messing around with some temperamental android multiboot thing that doesn't quite work with everything.