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Abbreviations used in this translation:
SR - Rabbi Yechezkel Sarna (1890–1969) (from hebrewbooks.org/41769)
ER - Rabbi Avraham Erlinger (from hebrewbooks.org/52042) (with author's permission)
SP - Rabbi Yosef Spinner (from hebrewbooks.org/51471) (with author's permission)
CS - Rabbi Moshe Chaim Shalenger (with author's permission)
MB - Mesilas Yesharim im Biruim (with author's permission)
NE - Netiv Eliezer by Rabbi Eliezer Lopian (with author's permission)
NH - Nefesh HaMesilah (with author's permission)
OG - Orot Genuzim by Rabbi Dovid Tzvi Hoffman (with author's permission)
LS - Leket Sichot Mussar by Rabbi Yitzchak Isaac Sher (1875–1952) (Vol.2, Kuntras Mesilat Yesharim, with permission of Slabodka Rosh Yeshiva (R.Shmuel Zacks), Bnei Brak. see original hebrew here for better understanding.)
Min - (level 1) for basic commentaries as relating to the plain meaning (Pshat).
Med - (level 2) elaborates more into the theme.
Max - (level 3) deeper in, including mystical excerpts from the Orot Genuzim commentary (Sod).
Max+ - (level 4) more commentaries for those familiar with the text.