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.
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ADbNewsSender is an easy to install and use php based newsletter script. You can use it to manage multiple newsletters. It is using double opt in and supports MySQL/MariaDB and PostgreSQL. You can also present a web archive to your website's visitor.
Please note that the development has been discontinued. You can still download the software, but you won't receive any support or updates.
poMMo is versatile Mass Mailing software. Add a mailing list to your website, or organize stand alone mailings. Unique features such as the ability to mail subsets of your subscribers set it apart from alternatives.