Japt-Proxy is a fast and reliable caching proxy for Debian's APT system. It is intended for environments where several Debian systems have to be kept up-to-date and downloading the same files over and over again from the Debian mirrors is undesirable. Even with high volume internet connections, it can dramatically reduce the time required to install or update Debian on many machines.
Repo-proxy is a package repository proxy. When a package manager is configured to use repo-proxy, all package requests will be copied and stored in a local cache directory for future use. If you have more than one machine on a local network, they can all share the same package download cache, saving bandwidth and lengthy download times. Repo-proxy can be run using several different methods to accept requests from clients (package managers such as apt-get or smart) for Release and/or Package files.