Please let me know if you find any more!
Many of these are on Wikipedia.
The name of the link adequately identifies the subject matter.
http://en.wikipedia.org/wiki/The_Name_of_the_Rose
http://en.wikipedia.org/wiki/Francis_of_Assisi
http://en.wikipedia.org/wiki/Franciscan#Renewed_controversy_on_the_question_of_poverty
http://en.wikipedia.org/wiki/John_XXII
http://en.wikipedia.org/wiki/William_of_Ockham
http://en.wikipedia.org/wiki/Bernardo_Gui
http://en.wikipedia.org/wiki/Apostolic_poverty
http://en.wikipedia.org/wiki/Humiliati
http://en.wikipedia.org/wiki/Peter_Waldo
The seven deaths compared to the seven trumpets of the Book of Revelations
http://165.29.91.7/classes/humanities/worldstud/97-98/tnotr/deaths/rose.htm
http://www.newadvent.org/cathen/01484b.htm Biased against Clareno because his position on poverty is "heresy", according to the Roman Catholic church, and this is the "Catholic Encyclopedia."
http://www.bautz.de/bbkl//a/angelo_d_c.shtml (in German)
http://en.wikipedia.org/wiki/Fraticelli
http://en.wikipedia.org/wiki/Fra_Dolcino
http://en.wikipedia.org/wiki/Dulcinian
The main precepts of the Dulcinian heresy:
Note too that Dolcino remained, and still remains, popular in the same area!
"Three years of armed resistance in the name of Christ had ended, but some of the Dulcinians survived and dispersed, and there are traces of their presence in the north of Italy until 1374.
Dolcino, Margaret and the Apostolics became symbols of freedom and emancipation to the present day, and were never forgotten. In the year 1907, the 600th anniversary of the martyrdom, huge celebrations were held in the Sesia valley, and a 12 meter high obelisk erected in the place of their last resistance.
The obelisk was later destroyed by the Fascists in 1927, but a small monument was built there again in 1974. Since 1974, on the second Sunday of September every year, a Dulcinian meeting is held by this monument."
Similar information here, on the "Fra Dolcino" page:
"...he was considered by some to be one of the reformers of the Church and one of the founders of the ideals of the French revolution and socialism. In particular he was positively reevaluated toward the end of the 19th century and was dubbed the Apostle of the Socialist Jesus and thus in 1907 left wing workers of Biella and the Sesia Valley erected a monument on the place of its last resistance. The monument was later (1927) symbolically gunned down by the Fascists."
This is conventionally called "quarrel between the regulars and the seculars". Friars live under a "rule" (Latin: regula); parish (and other) priests live "in the world" (Latin: saecula).
The best short introduct is the Wikipedia entry on William of Saint-Amour .