Applescript. Sends selected emails in Apple Mail to Evernote notebook. Takes any tags for each email set using MailTags plugin and converts these to Evernote tags. Emails sent are formatted and include attachments.
Ruby script framework for the encryption and decryption of email according the GPG/MIME Format (RFC 3156). It can be used for e.g. for Apple' Mail as replacement for GPGMail.
Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.
Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.