Shield Bot is an easy-to-use, entry-level robotics platform that helps you get into the world of robotics. With this kit you can build a line follower robot in a few minutes using the library and code provided.

RobotFrog

Expansion Kit for 3pi Robot.

Tamiya’s steel-ball caster is a good way to give a “third wheel” to a small robot powered by a differential drive. The kit comes with enough parts to make two casters, either 25 mm or 35 mm in height.

Unleash your inner Mad Max and make your vehicle a reality with the Mini Robot Rover Kit. This kit offers everything you need to build the frame of a two wheel drive Robot Rover! Obtains 4-6 VDC Chassis, Engines and Wheels. It will fill the rest with Power Supply, Microcontroller or Microcomputer and a Dual H Bridge Motor Controller.

Kit Tank Tracks DIY Chassis. Ideal for those who want to develop a project with Arduino.

Kit Chassis Romi from Polulu. Ideal for those who want to develop a remote controlled robot car, line follower, fire engine, etc.

Do you find the world of robotics interesting? It's very easy to create a robot! With this 2WD Round Chassis for Robot Cart, a microcontroller (Arduino), some sensors and programming you will be able to develop the robot of your dreams!

The Shadow Chassis is a marvelously durable and modular robot platform from RobotZone. 

O Seguidor de Linhas é uma placa longa composta por oito sensores IR. Este foi desenhado para seguir uma linha escura (spray ou fita isoladora) num fundo claro de cerca de 7,6 cm de largura ou menor . 

2WD 2+1 Wheels Robot Chassis Kit for the Arduino platform. Ideal for those who want to develop a remote controlled robot car, line follower robot, fire truck, etc.