ATLAST is the Autodesk Threaded Language Application System Toolkit.
John Walker wrote ATLAST in an attempt to make software component technology and open architecture applications commonplace in the mainstream software market. It was based on the FORTH-83 standard and was written in C for maximum flexibility. ATLAST is good, if a little bloated. Generally it's speed is satisfactory and it is quite easy to embed into C applications. One especially nice aspect is the extensive documentation in RTF, PostScript, and TeX formats.
ATLAST has been released into the public domain and is written in C.
