flashrd creates OpenBSD images tailored for embedded hardware devices and for executing from a virtualized environment. It installs a complete OpenBSD system with "one-touch" upgrade capability. It boots from a ramdisk to make in-place upgrades easy and complete. flashrd partitions for read-only operation by default, to minimize flash wear.
SONaFR is a small system based upon OpenBSD 4.1 and 5.1. Version 1.0 is a floppy version with router, NAT, and firewall capabilities. No hard disk or CD-ROM is necessary. The system boots off a floppy, and all you have to do is to configure it. It also has transparent firewall and bandwidth control capabilities. Version 2.0 has two bootable USB images (OpenBSD 5.1); one has 120 MB, and the other one 1 GB. It has DHCP, Midnight Commander (a Norton Commander clone), and various basic system tools.
CrissCross is a small cross-platform C++ library for console and file I/O, CPU identification (CPUID), hashing (MD2, MD4, MD5, SHA-1, SHA-256, SHA-512, Tiger), sockets (TCP and UDP only currently), and data structures (LList, DArray, RedBlackTree, AVLTree, SplayTree, etc). It is designed to run on Windows, Linux, FreeBSD, OpenBSD, NetBSD, Mac OS X, and even the Nintendo DS. Other platforms may become supported upon request. The main idea is to provide the ability to write a program using identical calls on the major platforms without needing to rewrite code.
Aqualung is an advanced music player originally targeted at the GNU/Linux operating system, and also running on FreeBSD, OpenBSD, and Microsoft Windows. It plays audio CDs, Internet radio streams, and podcasts as well as sound files in just about any audio format, and has the feature of inserting no gaps between adjacent tracks.