https://latin-dict.github.io/dictionaries.html
Fast introduction into the Latin-Latin dictionaries:
concise: Laurenzi
middle-sized: Reyher, Gallicciolli
extensive: Forcellini, Gesner, TLL
These and other monolingual dictionaries:
Appleton, 1914: Index verbōrum 
[Latin] 
Gallicciolli, 1778: Calepinus septem linguarum 
[Latin, Italian, Hebrew, German, French, Spanish, Ancient Greek] page index
(Anonymous), 2020: Lexicon Latīnum Tumblrense 
[Latin] 
Laurenzi, 1708: Amalthea Onomastica 
[Latin, Italian] page index
Popma, 1865: De differentiis verborum 
[Latin] 
Reyher, 1712: Theatrum Latino-Germanico-Graecum 
[Latin, German, Ancient Greek] 
Wikimedia Foundation, 2020: Victionarium Latinum 
[Latin] 
Baret, 1574: An Alveary or Triple Dictionary 
[English, Latin, French] 
Del Col, 2007: Diccionario auxiliar Español-Latín 
[Spanish, Latin] 
Georges, 1910: Kleines deutsch-lateinisches Handwörterbuch 
[German, Latin] 
Kazojć, 2010: Otwarty słownik łacińsko-polski 
[Latin, Polish] 
Lewis, 1890: An Elementary Latin Dictionary 
[Latin, English] 
López Pozo, 1997: Diccionario Español-Griego-Latín 
[Spanish, Ancient Greek, Latin] 
Poliachev, 2002: Большой русско-латинский словарь 
[Russian, Latin] 
Redmond, 2005: Glossarium Anglico-Latinum 
[English, Latin] 
Simpson, 1959: Cassell’s Latin Dictionary 
[Latin, English] 
Smith & Hall, 1871: A Copious and Critical English-Latin Dictionary 
[English, Latin] draft
Žepić, 1941: Rječnik latinskoga i hrvatskoga jezika 
[Latin, Croatian] 
Döderlein, 1875: Hand-book of Latin Synonymes 
[Latin, English] 
Dumesnil, 1819: Latin synonyms 
[Latin, English] 
John Hill, 1804: The synonymes of the Latin language 
[Latin, English] 
Popma, 1865: De differentiis verborum 
[Latin] 
Ramshorn, 1860: Dictionary of Latin synonymes 
[Latin, English] 
Shumway, 1898: A Hand-Book of Latin Synonymes 
[English, Latin] 
Skřivan, 1890: Latinská synonymika pro školu i dům 
[Latin, Czech] 
Spinelli & Fenzi, 2019: Latin near-synonyms 
[Latin] 
Wagner, 1878: Lexicon Latinum 
[Latin, French] draft
Elliott, 1998: Abbreviations in Latin Inscriptions 
[Latin] 
Gesner, 1749: Novus linguae et eruditionis Romanae thesaurus 
[Latin] page index
Lewis & Short, 1879: A Latin Dictionary 
[Latin, English] 
Nolte, 1744: Lexicon Latinae Linguae Antibarbarum 
[Latin] 
Smith, 1854: Dictionary of Greek and Roman Geography 
[Latin, Ancient Greek, English] encyclopaedia
Smith, 1873: A Dictionary of Greek and Roman biography and mythology 
[Latin, Ancient Greek, English] encyclopaedia
Smith, 1890: A Dictionary of Greek and Roman Antiquities 
[Latin, Ancient Greek, English] encyclopaedia
TLL, 1900-present: Thesaurus linguae Latinae 
[Latin] 
Bailly, 2020: Dictionnaire grec-français 
[Ancient Greek, French] 
Comenius, 2014: Janua linguarum reserata 
[Ancient Greek, Latin] 
Estienne, 1831-1865: Thesaurus Graecae linguae 
[Ancient Greek, Latin] page index
Frisk, 1960-1972: Griechisches Etymologisches Wörterbuch 
[Ancient Greek, German] 
Hederich, 1825: Novum lexicon manuale Graeco-Latinum et Latino-Graecum 
[Ancient Greek, Latin] page index
Liddell & Scott, 1940: A Greek-English Lexicon 
[Ancient Greek, English] 
Verkerk, 2020: Morphologia Graeca 
[Ancient Greek] 
Schrevel, 1831: Lexicon manuale graeco-latinum et latino-graecum 
[Ancient Greek, Latin] page index