DeltaRPM is a tool that generates RPMs that contains the difference between an old and a new version of an RPM. This makes it possible to recreate the new RPM from the deltarpm and the old one. You don't have to have a copy of the old RPM, as it can also work with installed RPMs. The package also contains tools for creating and applying delta ISOs.
Releaser is a set of scripts to automate and manage the tasks related to software package releases. It is designed to be modular and to make it easy to both select a particular set of actions associated with releases of a particular project (such as changelog generation, uploading of tarballs, posting announcements to mailing lists), and create new actions that integrate seamlessly into the process. Its status is still somewhat experimental, but the most basic functionality is there.
ControlTier is a set of tools and an automation framework for deploying and managing multi-tier Web applications (or any application stack). It orchestrates the deployment and updating of code, data, and content across multiple physical, virtual, or cloud-based servers or clusters. Multiple tools include a command dispatching framework, a self-service Web interface, a multi-purpose CMBD/inventory tool, and a reporting infrastructure. Tools can be used individually or as an integrated system for large scale use.
moap is a Swiss army knife for project maintainers and developers. It aims to help in keeping you in the flow of maintaining, developing, and releasing. It automates whatever tasks can be automated. It allows you to parse DOAP files and submit releases, send release mails, create iCal files and RSS feeds, maintain version control ignore lists, check in based on the latest ChangeLog entry, and more.
0release is a program to generate source and binary releases automatically. With minimal configuration, 0release will generate a source tarball release candidate, build it to create a binary archive, upload them to your Web server, check the uploads, and tag the release in GIT and update the version number. It can run unit-tests and custom actions, such as building documentation, etc. For Zero Install users, it can also upload a signed XML metadata file about the release, allowing these users to upgrade automatically. Releases are signed with your GPG key.