https://discord.gg/Ar5FndTkJM server for all pagan faiths excluding wicca and other new age pseudo-religions. NO /POL/TARDS, PROGRESSIVE PAGANS, ESOTERIC HITLERISTS OR OTHER IDENTITY IDOLATERS MAY PARTICIPATE.
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HANDBOOKS FOR PAGAN RELIGIONS:
Roman polytheism/Cultus Deorum Romanorum
https://archive.org/details/ReligioRomanaHandbook/mode/2up

Hellenism
https://book4you.org/book/5494536/af559d

Anglo-Saxon polytheism
https://book4you.org/book/5933117/5cd5d9

Norse polytheism
https://book4you.org/book/5301863/f83798

Frankish polytheism
https://frankisk-allodium.com/cultus/

Gaulish Celtic polytheism
https://www.amazon.com/Ancient-Fire-Introduction-Gaulish-Polytheism/dp/0988900920

Welsh polytheism
https://book4you.org/book/13360176/a0f141

Irish polytheism
https://www.amazon.com/Pagan-Portals-Paganism-Reconstructing-Polytheism/dp/1785351451/ref=sr_1_1?__mk_es_US=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=irish+paganism&qid=1628195425&s=books&sr=1-1

Slavic polytheism
https://book4you.org/book/3304048/bc27ba

Hinduism
https://book4you.org/book/5290168/a27c6f

Baltic polytheism
https://vdocuments.mx/baltic-religion-en-www.html

Egyptian polytheism:
(the amazon link to the guide on Kemetism is no longer available.)

Etruscan religion
https://book4you.org/book/703887/eef427

Mesoamerican religion
https://book4you.org/book/13516647/a55de4

Mesopotamian religion
https://book4you.org/book/5556771/2331bd

Zalmoxianism
https://book4you.org/book/3649078/b925a6

HANDBOOKS FOR PHILOSOPHY AND THEOLOGY:
Early Neoplatonism
https://book4you.org/book/3512648/879038
https://book4you.org/book/857301/1bc350

Late Neoplatonism
https://book4you.org/book/2747349/5d0ec3
https://book4you.org/book/816301/f9b2ad
https://book4you.org/book/969493/829f95
https://book4you.org/book/2030595/7c78c3
https://book4you.org/book/1235915/2bf749
https://book4you.org/book/17106658/f0ca5c

Julian's Neoplatonism
https://book4you.org/book/5226053/61f8a8

Pythagoreanism
https://book4you.org/book/2270846/9502d5
https://book4you.org/book/2928718/3ca095
https://book4you.org/book/1070628/59c8ef
https://book4you.org/book/1085236/bce6fe

Orphism
https://book4you.org/book/5010453/7f2ce5

Modern polytheist theology to help beginners grasp the essence and structure of polytheism.
https://it.book4you.org/book/5705800/ec725c
https://it.book4you.org/book/2765523/b27f34
https://it.book4you.org/book/2744172/c9389a


An extensive list of Buddhist Sutras translated in English
http://buddhasutra.com/


DAILY RITUAL FORMS:
Daily rituals for Cultus Deorum Romanorum
http://www.novaroma.org/nr/Daily_rituals_(Nova_Roma)
https://hellenicfaith.com/household-worship/

Some examples of prayers adressed to the Hellenic Gods
https://athenaswisdom22.wordpress.com/hellenic-rituals-2/hellenic-rituals/

Reconstructionist friendly rituals for Celtic polytheism.
https://www.magcloud.com/browse/issue/1048997

CALENDARS:
Religio Romana
http://www.poesialatina.it/_ns/Latino&Javascript/DataRomana.htm
Hellenism
https://www.hellenion.org/calendar/
Celtic polytheism
https://time-meddler.co.uk/dynamic_celtic_calendar.php
NOTE: as highlighted by user @foxmulder this is a questionable calendar because the Celts and the Germanic peoples considered a day to start on sunset, not at sunrise, hence the real dates would be split.
Norse
http://norroen.info/calendar/script.html
https://time-meddler.co.uk/the-old-icelandic-calendar/
Maya
https://maya.nmai.si.edu/calendar/maya-calendar-converter
Aztec
https://www.azteccalendar.com/
Egyptian
https://planetcalc.com/8434/

WHERE TO BUY IMAGES OF THE GODS FOR YOUR RITUALS:
https://123statues.com/
https://jelldragon.com/collections/norse-god-statues/
https://www.celticjackalope.com/product-category/statues/celtic-goddess-statues/
https://www.wulflund.com/sculptures/europe/bohemia/