IDEAL In-Sure Push-In Wire Connector, 10 AWG, 3-Port, 150 (Jar) 30-1039J - The Home Depot
Fan Wire Wire Connector FA-3-3
Amazon.com: ONLINE LED STORE 3-Wire Weather Pack Connector Kit Assembled with 10" 12 AWG Wires : Automotive
JST PH 2.0mm 3-Pin male female housing connector wire to wire 20cm 26AWG 10 set | eBay
2C LED Strip Light Wire to Wire T Connector – Armacost Lighting
Pololu - Screw Terminal Block: 3-Pin, 3.5 mm Pitch, Side Entry (4-Pack)
Snap Action 3-to-3 Wiring Block Connector [Clear PCT-2-3M] : ID 5618 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Wire Connectors - Low Voltage T Tap Wire Connectors, 3 Way Wire Connector, T Type 2 Pin Solderless No Wire Stripping Required for LED Strip, Automotive Connection Fits 24-20 AWG 12 Pack - Amazon.com
3 Pole AC/DC Clamp Down Wire Connector 12AWG-28AWG - Ecolocity LED
Automotive water-resistant connectors
IDEAL In-Sure Push-In Wire Connector 3-Port Orange (10 per Bag, Standard Package is 6 Bags) 30-1333S - The Home Depot