The Rashbatz (Rabbi Shimon Ben Tzemach, 15th century) authored a commentary on Rashbag's (Rabbi Shlomo ibn Gabirol, 11th century) Azharos (poem on the 613 mitzvos) called Zohar HaRakiah.
There's an old version on HebrewBooks from 1879. I'm wondering if anyone ever republished a newer version and where to get it. I saw in the Encyclopedia of the Taryag Mitzvos that they used the "Feldheim edition", which sounds new, but I couldn't find it on their site or on Google.