aptly
Debian repository management tool
...You can try it right now for free, aptly is available both as CLI tool and HTTP REST service. Quickly serve published snapshots over HTTP. Take and update mirrors of any Debian/Ubuntu remote repository. At any point in time, take a snapshot of the mirror to fix the current set of packages. Merge two or more snapshots into one snapshot: e.g. merge wheezy and wheezy-updates. Manage your own repositories of packages, merge them with official and publish the result. Any snapshot could be published back as a repository (only HTTP server is required). ...