Histwi is a Linux desktop program for Twitter account management. It allows you to download and save all your Tweets to a database, view and export all saved Tweets to HTML or text files, compare your Following to Followers, follow/unfollow any your friends, track new followers and unfollowers, and manage multiple Twitter accounts.
Proxmox is a Debian-based bundle of OpenVZ, KVM, and a Web based management GUI. It supports high-performance container-based virtualization of Linux workloads, as well as lower performance KVM hardware assisted virtualization. It supports any hardware that the Linux kernel supports, and will permit live migration of running OSIs with shared storage configurations (DRBD, CIFS, NFS, etc.). It comes bundled with many virtual appliance templates (Drupla, Moodle, FreePBX, etc.) and generic OSI appliances (Fedora, Debian, Ubuntu), as well as a faculty for building arbitrary Linux based appliances. It can be used for virtual desktop infrastructure (VDI) and virtual server infrastructure (VSI). It supports almost any x86/x64 OS in a KVM container and any Linux-based OS in OpenVZ.
Valvula is a high performance mail policy daemon for Postfix. It provides out of the box support for sender login mismatch, mail quotas, per user and per domain blacklists and whitelists, and much more. It is system administrator friendly, providing many automatic features like automatically detecting Postfix MySQL databases to determine local domains and local accounts. It is fully extensible through plugins.