The LDS Anarchy blog has some stuff about plural marriage that is worth reading. Here are a couple of posts posts about civil marriage.
The Briney family’s blog. I like this post by Auralee about jealousy. The Brineys were one of the families on Seeking Sister Wife (a reality TV show on TLC that aired beginning in January 2018).
Benjamin Shaffer’s blog (which is also the unofficial website of his fundamental Mormon sect). He has some pieces on polygamy, including this interesting post about the outlawing of plural marriage in Jacob chapter 2. (Fun fact: Benjamin is Drew Briney‘s law partner.)
Glossary of terms used on this blog.