The LensForge distribution includes lens files in ZMF format from Edmund Optics and ThorLabs. The ZMF file format used by the ZEMAX lens design program is often used as a format for the publication of lens catalogs.
Actually Edmund Optics provides the ZMF file compressed within a self-extracting archive in EXE form intended for Windows computers, but Stuffit Expander for Mac can open it.
To use a ZMF file with LensForge, you just open the file with LensForge and drag the lenses you want into your lens design.
The screen capture above shows how LensForge presents a ZMF file. You can select any of the lenses in the list at left and drag them into your lens design. You can also enter a string into the search box at upper right and that will restrict the list of lenses to those whose name contains the specified string.