This page list advantages for a software project to be packaged in Debian:
- Your users can install your software like any other Debian software with the package manager they're used to.
- Administrators of larger installations can install your software from the official archive and don't need to make special effort to provision your software.
- Your users install your software from a trusted repository. All Debian packages are cryptographically signed with the key of the Debian archive.
- It's easier to keep the dependency list of your software current if your software is in the archive. The Debian QA scripts will automatically find problems in the dependencies.
- Debian Maintainer take care that your software fits as well as possible into the larger system, playing nicely with things like system startup, logging, file types, network setup, desktop environment and many more.
- The packaging process is an additional cost-free review by an external developer who also knows other software projects and has knowledge about free software.
Packages that are in Debian are also automatically available in all Debian derivatives like Ubuntu.
- There are known cases, where the source code of free software projects became unavailable. You don't want this to happen to one of your dependencies! As long as your project is available in Debian you can be sure that the source code of all your dependencies is still available.
If you want your software to be packaged for Debian, then you might be interested in Debian's Upstream Guide.