dvcs-autosync is an open source replacement for Dropbox/Wuala/Box.net/etc. based on distributed version control systems (DVCS). It offers nearly instantaneous mutual updates when a file is added or changed on one side but with the added benefit of (local, distributed) versioning and that it does not rely on a centralized service provider, but can be used with any DVCS hosting option including a completely separate server.

par2cmdline is a command line utility for creating and using PAR2 files to detect and repair damage in data files. It is most commonly used as part of backup systems as well as on Usenet.

The GtkHash extension for thunar which allows users to compute message digests or checksums using the mhash library. Currently supported hash functions include MD5, MD6, SHA1, SHA256, SHA512, RIPEMD, TIGER and WHIRLPOOL.

Bare metal GNU debugger for embedded ARM chips using Cortex-M0/M0+/M3/M4, Cortex-R4/R5/R7 and Cortex-A* processors. GDB is a source-level debugger, capable of breaking programs at any specific line, displaying variable values, and determining where errors occurred.

zulucrypt is a suite of applications for creating and managing volumes encrypted with luks, plain, truecrypt and veracrypt.

hping3 is a network tool able to send custom ICMP/UDP/TCP packets and to display target replies like ping does with ICMP replies. It handles fragmentation and arbitrary packet body and size, and can be used to transfer files under supported protocols. Using hping3, you can test firewall rules, perform (spoofed) port scanning, test network performance using different protocols, do path MTU discovery, perform traceroute-like actions under different protocols, fingerprint remote operating systems, audit TCP/IP stacks, etc. hping3 is scriptable using the Tcl language.