My mission with my tumblr is to help you find official resources to consume manga; doing it these ways will help the mangaka who work to bring you content and it encourages English publishers to bring over more series.
Check under the cut for legal websites, apps and retailers with detailed information. At the bottom you'll find surveys and ways to contact publishers with requests.
You can use regular retailers to buy digital and print: Amazon/Kindle, Kobo, Barnes and Noble, Bookwalker, Google Play, Apple Books, Nook
There are apps available for buying volumes, chapters, using ticket systems to access free content, or with subscriptions.
Mangamo - $4.99/mo for 200+ titles; titles available for purchases with in-app library
Viz manga - $1.99/mo; titles available to purchase with in-app library (carries titles from Viz, but not their SJ series)
Shonen Jump - $2.99/mo; titles available to purchase with in-app library (carries specifically SJ titles, which are often popular shounen)
Comikey - uses a key system; ability to read for free with ads and patience
Kmanga - app maintained by Kodansha; chapters are often available to read for free through a ticket system and able to purchase
Kodansha - a website where you can create a free reading account. They offer 3 free chapters on all their manga, occasionally feature several free volumes, and run sales on their content somewhat regularly.
MangaPlus - $1.99 or $4.99 for a subscription; will allow a free read of their simulpub series.
MangaPlaza - 7 day free trial; $6.99/mo; [info incoming, seems to have more mature licenses]
INKR - 3 ways to access content; free, coins & 'Extra Membership'. Extra can cost $4.99/mo or $44.99/year and gives you access to content, extra savings and "free ink" that can be traded for their coin system. (Used to be Manga Rock and that was a fun read from them)
MangaPlanet - $1.99/week -> $47.99/year depending on which tier you pay for.
MangaUP - 1 month free trial, $4.99/mo; you can browse their 'vault' to see if things you like are included
Irodori Comics - hosts 18+, specializes in doujinshi, more info incoming
Renta! - point system; 1 point = 1 cent; regular bonus points for higher purchases
ComiXology - $4.99/month; a service through amazon that allows you access to comics, manga and graphic novels. Specifically boasts {2400} manga titles.
Animeplanet - has a library of completely free comics and anime through partnerships; seems to host less manga styled comics but free is free.
Manta, Comicle, Webtoon, Tappytoon, Tapas, WebComics, Bilibili will be looked into but they host mostly webtoon style comics
Seven seas has a (mostly) monthly survey that is linked on their homepage at all times. {They will pull from any publisher, including digital only simulpubs}
If you have a bookwalker account, I found a Google doc that you fill out requests and they send them to publishers.
To send suggestions to Viz, use this survey that is listed through their Contact Us page (you select the "Series Suggestion" and will be redirected) {they mostly pull from shogakukan and shueisha titles}
To send suggestions to Kodansha, go to their contact us page and there are 2 useful drop downs; suggest reprints and suggest series, suggest series is also useful to request a print of anything they've licensed digital only. {They pull almost exclusively from Kodansha Japan}
TokyoPop has a discord server where they look at your suggestions in the channel #licensesuggestion
If you are able, in any way, support official English releases. It shows it is a lucrative business decision to continue the manga. Nothing is worse than starting something and being unable to finish it because it stopped getting translated and published.
I will update this post as needed, enjoy your manga! ♡