bridges:
https://bridges.torproject.org/options
Or send email to their email bridges@torproject.org
get transport obfs4

Search Engines:
duckduckgo.com - https://3g2upl4pq6kufc4m.onion/
NotEvil hss3uro2hsxfogfq.onion/ 
torch xmh57jrzrnw6insl.onion/
ahmia - msydqstlz2kzerdg.onion

Listings:
hidden wiki http://zqktlwi4fecvo6ri.onion/wiki/index.php/Main_Page
dark.fail darkfailllnkf4vf.onion - PGP verifies links
deep web subredit: https://www.reddit.com/r/deepweb/
onions sub reddit - https://www.reddit.com/r/onions/

Others:
hidden answers answerstedhctbek.onion
dread - reddit http://dreadditevelidot.onion/
privacy sub reddit - https://www.reddit.com/r/privacy/

Fake Identity:
http://elfq2qefxx6dv3vy.onion/fakeid.php

Temp Mail:
http://grrmailb3fxpjbwm.onion/
https://www.guerrillamail.com/
https://tempmailaddress.com

Huge list of other providers - https://gist.github.com/michenriksen/8710649

temp mail - http://grrmailb3fxpjbwm.onion/
Proton Mail - https://protonmail.com/ OR https://protonirockerxow.onion/login
torbox - http://torbox3uiot6wchz.onion/
elude - http://eludemaillhqfkh5.onion/
Riseup - http://nzh3fv6jc6jskki3.onion
mail2tor - http://mail2tor2zyjdctd.onion/


Full list (keep in mind links might not work, if they don't then look for the service name in search engines or in link directories)
https://www.reddit.com/r/onions/comments/6krt34/list_of_onion_email_providers/