AVRDUDE (AVR Downloader Uploader) is a program for downloading and uploading the on-chip memories of Atmel's AVR microcontrollers. It can program the Flash and EEPROM. Where supported by the serial programming protocol, it can program fuse and lock bits. AVRDUDE also supplies a direct instruction mode, allowing one to issue any programming instruction to the AVR chip regardless of whether AVRDUDE implements that specific feature of a particular chip.
Arduino is a physical computing platform based on a simple micrcontroller board and a development environment that implements the processing language. It can be used to develop stand-alone interactive objects or can be connected to software on your computer such as Flash, Processing, MaxMSP, PD, or VVVV.
BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides minimalist replacements for most of the utilities you usually find in GNU fileutils, shellutils, etc. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts. BusyBox provides a fairly complete POSIX environment for any small or embedded system.
CANpie defines a Standard API for access to the CAN (Controller Area Network) bus. The API provides functionality for ISO/OSI Layer 2 (Data Link Layer). The CANpie driver is the base for HLPs like CANopen, DeviceNet, J1939, etc. Through its low memory footprint, CANpie can be used for embedded applications (without any OS) as well as for Linux. Access to the Linux CAN driver is via a socket interface (AF_CAN).