This fonts are authors' property, and are either shareware, demo versions or public domain. The licence mentioned above the download button is just an indication. Please look at the readme-files in the archives or check the indicated author's website for details, and contact him if in doubt. If no author/licence is indicated that's because we don't have information, that doesn't mean it's free.
I decided to make a design which incorporated the thinnestlightest weight lines possible in FontStruct. This is the result; I'll add more if people like it.
These 132 lines cannot be accurately nudged, so a unique line has to be built for each vertical position where I want a line. These lines also cannot be centered on a place where two curves meet such as the middle of B or R. This introduces some unintentional asymmetry to the design, but I like it, so I'll keep it.
There is also the problem that forming a diagonal line of the same line weight is nearly impossible. While angled 132 lines can be formed, their angles are all close to 0. No method exists for making a line which slants at 45 degrees while also being 132 weight.