Choosing a debug/programming connector for a microcontroller (PartsBox)
Connectorless connector
Open Hardware Pogo-Pin Programmer | [protofusion]
Pcb Test Fixture Tool Test Probe Pogo Pin Pitch 5pin 1.5mm Test Programming 1.5 Mm Download Fixture Jtag Hand Held Tool - Pc Hardware Cables & Adapters - AliExpress
AVR ISP connector with pogo pins - Daumemo
Choosing a debug/programming connector for a microcontroller (PartsBox)
A Small Replacement For Large Programming Headers | Hackaday