Maintainers tools

Can I use them ?

You guys can't use most of those tools, as you'll need access to the live server to use most of those.

backup (server-side) is the server-side backup script run nightly on the server. Scene.org does some other backups on her side too.
cleanup_codebase (client-side) can be used by anyone, it's used to apply some dumb rules on the codebase to ease collaboration. e.g. enforce the use of 4 softtabs to indent the code. It should be run from time to time by the maintainers to make sure that the codebase is clean. New rules can be easily added.
deploy (server-side) is the server-side script that deploys a new version when Github tells Pouët that there is one.
dump_DDL (client-side) is used to dump the live schema of the database in the local pouet.sql file. Then the commiter can commit the change and keep track of the changes that happened to the database schema.
dump_SQL_for_dev (client-side) can be launched to generate an updated version of the free to use data dumb that is offered to anyone willing to work on a local version of pouet. The output goes in contribs/pouet_with_sample_data.sql
sync (client-side) can sync the current code base on the staging and live servers, and the other way. You sync push live, sync pull live, sync push live and sync push live. Pretty explicit no ?
sync_v2 (client-side) is the same as sync, but dedicated to Pouët v2, which is still being worked on.