Parshuram kalpa sutra is a manual for srividya. I am searching for good english and hindi commentary on it. Online or book links please.
There is one Sanskrit-Hindi version available with Sanskrit and Hindi verses and commentary. Author is Dr. Paramhansh Mishra.
One can buy the book from exoticindiaart; here is the link to that: परशुरामकल्पसूत्रम् (संस्कृत एवं हिन्दी अनुवाद)- Parashuram Kalpa Sutra
I don't know about English Translation yet but there are some Hindi translation available. One provided in this answer is also good.
Sometimes, in addition to translation commentary would be more useful to understand the meaning in deeper way. One book is available from Chaukhamba Surbharti Pratishthan publication:
This is a Sanskrit text with Hindi Tika by Acharya Mrityunjay Tripathi. Will update the answer if I find any English translation.