Freecast is free and very simple script which allows you to broadcast members using any member's database. It allows you to send the mails accordingly to any hosting or anti-spam limitations. The sender script can also be scheduled as a cron job.
Retweeter is a PHP and MySQL script for creating broadcast Twitter accounts. A broadcast Twitter account is an account which automatically retweets every tweet it's friends tweet out. So simply configure an account to follow certain other key accounts, link Retweeter to it and the script will automatically retweet everything the key accounts share. It works perfectly with a cron ...