https://sites.google.com/site/tymellsheresy/legion-timelines

https://docs.google.com/spreadsheets/d/1aQIqaFzYj_TkeQpU1uqZ3dGXpmlxg8LIZex6X7btgrM/edit#gid=0

https://rateyourmusic.com/list/Tymell/the-horus-heresy-series-a-chronological-reading-guide/

Related books 

    Battle of the Fang by Chris Wraight is technically not a part of the Horus Heresy series, but it is the culmination of A Thousand Sons and Prospero Burns.
    Angels of Darkness by Gav Thorpe was written a few years before the Horus Heresy books got started, but its B-plot revolves around Astelan, one of the "fallen" Dark Angels, and his recollections of the final schism of the Dark Angels. Astelan would later become one of the focus characters in Fallen Angels.
    Titanicus by Dan Abnett, which wraps up some hanging plot threads from Mechanicum.
    Macragges Honour, A comic book by Dan Abnett and Niel Roberts, which follows the crew of the Ultramarines' flagship as they give chase to Kor Phaeron during the Battle of Calth.
    The Night Lords trilogy by Aaron Dembski-Bowden is set after the Heresy, but has enough flashbacks and chapters set during that time that it not only functionally acts as the Night Lords' entries in the Heresy series due to covering more of their actions than the "official" Heresy novels to date, but also provided at least one character for the Horus Heresy tabletop game.
    The Black Legion series has sections that function as a direct sequel to the events of the Horus Heresy series.
    The Thousand Sons series directly continues the plot of Ahriman.
    Pandorax is a Distant Finale to the events of The Damnation of Pythos.
    Wrath of Iron is loosely connected to Fulgrim.