tweetr is a platform that allows you to create and queue tweets to be shared when YOU want. You create content when you have time and then use FOSS and NOT pay whatever-ridiculous amount of $$$ for posting them automatically.
If you want to use an already set-up application decrypt (and verify)
tweetr init App key: ... App secret: ...
Then, authorise users by pasting the provided link into a logged-in browser then entering the resulting PIN:
tweetr add-user Visit this URL: ... Enter the PIN from that page: ...
Afterwards add tweets:
tweetr queue-tweets Author (or empty to finish): ... Tweet content: ... Time to post the tweet (RFC2822 or RFC3339): ... Author (or empty to finish):
At any point after
init you can start the daemon, which will be posting tweets:
tweetr start-daemon Posted tweet "..." scheduled for ... by ... at ... with ID ... Posted tweet "..." scheduled for ... by ... at ... with ID ...
For more detailed information see the manpages.