In Embedded system a set of applications used to perform a complex task or to create a product, which is typically another computer program or a system of programs. Tools are linked (or chained) together by specific stages. Output or resulting environment state of the tool becomes input or starting environment for the next one. By default the host contains some development tools which are called native tool-chain. Here is the presentation that shares mode details on components of tool-chain and how to build them for your own embedded distribution.