RJ12 Jack Connectors - EV3/NXT LEGO Compatible - Pack of 10 : ID 4434 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: KonHaovF 182PCS Gear and Axle Set for Technic Parts Compatible with Major Brand Technic Parts, DIY Gears Assortment Pack(Liftarm, Pins, Axles, Connectors) for Technic Building Blocks Set : Toys & Games
Open Source Lego Controller | Hackaday
Buy it or Meme it! Everything You Need to Know About Lego Piece 98989
Wireless Power Connector (2 pack), LEGO® lighting – Light My Bricks USA
Amazon.com: LEGO Functions Power Functions Extension Wire 20 8871 : Toys & Games
Technical Parts Pins Connectors | Lego Technic Compatible Parts - Parts Building - Aliexpress
Synthesize-your-own NXT® connector plug
The Power Functions 2.0 connector
Wireless Power Connector (2 pack), LEGO® lighting – Light My Bricks USA
Lego Technic Axle and Pin Connector Connectors - Pick your style and color | eBay
LEGO Style Custom Headers. Yes, That's Right #shorts - YouTube
New legends | New Elementary: LEGO® parts, sets and techniques
Magnetic Power Coupler for LEGO Trains | Brickstuff