Openads (aka phpAdsNew & phpPgAds) is an open-source ad server with an integrated banner management interface and tracking system for gathering statistics. With Openads you can easily rotate paid banners and your own in-house advertisements.
phplist is an open-source newsletter manager. A feature-rich mailing script, which includes multiple mailing lists and attachments. phplist is free to install and use, and is easy to integrate with any website. phplist is listed in the top open source projects for vitality score.