Pi-Hole resources:
https://github.com/pi-hole/pi-hole
https://github.com/WaLLy3K/Pi-hole-Block-Page
Use the instructions under "discontinued as of Pi-hole v3.2".
Camera:
https://www.bouvet.no/bouvet-deler/utbrudd/building-a-motion-activated-security-camera-with-the-raspberry-pi-zero
Further tweaking - https://github.com/HackerShackOfficial/Smart-Security-Camera
AI: - No
Need USB Microphone
https://github.com/alexa/alexa-avs-sample-app
https://github.com/MycroftAI/mycroft-core
https://github.com/snipsco/awesome-snips
https://github.com/Picovoice/Porcupine
IoT: - No
Not really interesting enough, fiddly
https://github.com/Microsoft/RIoT
https://github.com/hybridgroup/gobot
https://github.com/rwaldron/johnny-five
https://github.com/home-assistant/home-assistant
Flight: - Eh, no? Maybe?
Pricey, fiddly
https://github.com/PiStuffing/Quadcopter
https://github.com/vjaunet/QUADCOPTER_V2
https://github.com/solenerotech/quadcopterPi
https://github.com/benripley/Arduino-Quadcopter
Machine Learning:
https://github.com/samjabrahams/tensorflow-on-raspberry-pi
Random:
https://github.com/thibmaek/awesome-raspberry-pi
https://github.com/macunixs/dualshock4-pi
https://github.com/s-matyukevich/raspberry-pi-os
https://github.com/jacobsalmela/raspberry-pi-router
https://bpwalters.com/blog/setting-up-a-raspberry-pi-web-server/
https://www.raspberrypi.org/forums/viewtopic.php?t=20826
https://www.youtube.com/channel/UCvrLvII5oxSWEMEkszrxXEA/videos
RetroPi
NAS server
Robot
Learn Python/C
Music streaming