Files with the TFM extension identify font metric files used with the TeX typesetting system. TFM files store a font typeset (dimensions) and nothing else. The fonts glyphs are contained in another location and can be applied by using other types such as PFM and AFM. TFM files can be opened with compatible typesetting software.
FormTool Gold was developed by IMSI in 1990's. No longer published.
File extension is used by Transform developed by Michael Bone. Compressed file.