HLK-LD2410B + ESP32: The DIY Presence Sensor
A $4 radar module and an ESP32 get you real 24GHz presence detection with native ESPHome support, if you are happy to solder four wires.
Reviews
Linptech ES1 Presence Sensor Review
The ES1 sits between the cheap Tuya units and the Aqara sensors: true 24GHz radar, native Z2M support, and consistent quality.
Sonoff SNZB-06P Presence Sensor Review
Sonoff's budget presence sensor is honest about what it is: a small-room occupancy sensor that pairs instantly with Zigbee2MQTT.
Tuya ZY-M100 24GHz Presence Sensor Review
At around $15 the ZY-M100 made whole-home presence detection affordable. You need to buy the right variant and spend a few minutes tuning it.
Aqara FP1E Presence Sensor Review
The FP1E drops the zones and multi-person tracking of the FP2 but keeps the detection quality, runs on Zigbee, and pairs straight into Zigbee2MQTT.
Aqara FP2 Presence Sensor Review
The FP2 tracks up to five people across 30 zones in a single room. It costs more than the Tuya options, and for open plan spaces it is worth every dollar.