Holder Uno Type
It fits every UNO sized boards, and you can choose among a number of nice colors, as they’re all of the same size and they can all be used on the same type of boards.
Arduino USB 2 Serial Micro
This board converts a USB connection into a 5 volt Serial TX and RX that you can connect straight to the Arduino Mini or other microcontrollers, allowing them to talk to the computer. It features an Atmega16U2 programmed as a USB-to-serial converter, the same chip found on the Arduino Uno.
Arduino Mini USB Adapter
This board converts a USB connection into 5 volt TX and RX that you can connect straight to the Arduino Mini or other microcontrollers, allowing them to talk to the computer. It is based on the FT232RL chip from FTDI (drivers are included with the Arduino software).
Arduino Robot LCD
The Arduino TFT screen is a backlit LCD screen with headers. You can draw text, images, and shapes to the screen with the TFT library. There is an onboard micro-SD card slot on the back of the screen that can, among other things, store bitmap images for the screen to display.
The Arduino ISP allows you to upload sketches and burn the bootloader on any AVR based Arduino boards. By uploading a sketch with an external programmer you can remove the bootloader and use the extra space for your sketch. The Arduino ISP can also be used to burn the Arduino bootloader, so you can recover your chip if you accidentally corrupt the bootloader.
NB. Works with any AVR ISP chip with 64K of flash (or less) - does not work with Atmega1281/1280/2561/2560