Observatory by Mozilla is a project designed to help developers, system administrators, and security professionals configure their sites safely and securely.
BorgBackup (short: Borg) is a deduplicating backup program. Optionally, it supports compression and authenticated encryption.
ldapvi is an interactive LDAP client for Unix terminals. Using it, you can update LDAP entries with a text editor.
combines many functions in a single, portable executable that belongs onto every USB stick. Search and convert text files, instant simple FTP/HTTP server, find duplicate files, compare folders, treesize, run own commands on all files of a folder - it's all within a single tool. Distributed for free under the BSD License.
display active client connections for Squid
Glances is a CLI curses based monitoring tool for GNU/Linux or BSD OS.