They've some of the most forked fonts, appearing in a dozen different forms (or more) in your average distro.
Unfortunately none of the forkers ever tried to consolidate this mess (like DejaVu did for the Vera derivatives), so the result is underwhelming. Many similar fonts with different problems usually still in the dying Type1 format.
The latest iteration is TEX Gyre which might have been it (modern format, good quality), if the GUST people had not blown the licensing bit big time.