Official OmniAuth strategy for Mangoapps

MAPS.ME passport strategy for OmniAuth, complete with regual and access token strategies

OmniAuth Strategy for Mastodon

Strategy to authenticate with matiq UG (haftungsbeschränkt) via OAuth2 in OmniAuth.

Official OmniAuth strategy for Mattermost.

OmniAuth strategy for Mavenlink.

OmniAuth strategy for minecraft.jp

OmniAuth strategy for Medium.

MindMeister Oauth2 strategy for Omniauth. This allows you to authenticate to MindMeister from your ruby app.

Omniauht strategy for Mercado Livre.

Official OmniAuth strategy for Memair.

OmniAuth strategy for Memberful

Unofficial Mendeley strategy for OmniAuth 1.0

OmniAuth strategy for Mention (OAuth 2.0)

A MercadoPago strategy for OmniAuth

OmniAuth strategy for Mesosphere

OmniAuth plugin for AT&T mHealth

Unofficial Microvellum strategy for OmniAuth 1.0

OmniAuth strategy for miil

An OmniAuth strategy for a Mindvalley account (shamelessly stolen from https://github.com/ZenCocoon/omniauth-testoauth2strategy).