The following is a list of software projects maintained in the NetBSD (and/or pkgsrc) source tree to consider for individual distribution for third-party use. Some of the following software is already distributed standalone.
ash/sh
Debian/Ubuntu use GPL'ed dash, which is derived from NetBSD ash.
bmake/pmake
Already provided by Linux distributions (like Fedora and Debian).
calendar
editline/libedit
Alternative to GNU Readline. Already provided by Linux distributions (such as Fedora) and used in various projects, e.g. PostgreSQL.
inetd
ipsec-tools / racoon
User-space IPsec tools for various IPsec implementations. ftp://ftp.netbsd.org/pub/NetBSD/misc/ipsec-tools/
iscsi-target
Packaged by Fedora.
libatomic
Atomic operations for many architectures.
libc
Alternative to glibc and uClibc. Used by MINIX3 and partially by Android.
libcontainer
Red-black tree, patricia-tree, radix trees.
libhash
Collection of hash functions.
libprop/proplib
Property Container Object Library. PropertyList aka plist API.
libsaslc
Simple Authentication and Security Layer client library.
makefs
Included in MirBSD and packaged by Debian.
mtree
nawk
? Only if we have improvements and if upstream is not maintained.
nbsed
netpgp
PGP signing, verification, encryption and decryption library and utilities. Alternative to gpg and pgp. ftp://ftp.netbsd.org/pub/pkgsrc/distfiles/LOCAL_PORTS/
netresolv
Networking related APIs, from historical BSD and former libbind. netresolv
nvi
? Only if we have improvements and if upstream is not maintained.
rbootd
Packaged by Debian.
rcorder (and rc.d scripts)
stat
Included with Mac OS X.
tnftp/ftp
Ftp and http command line client. Packaged by Debian. Included in Mac OS X. ftp://ftp.netbsd.org/pub/NetBSD/misc/tnftp/
tnftpd/lukemftpd
Included with Mac OS X. ftp://ftp.netbsd.org/pub/NetBSD/misc/tnftp/
vacation
Packaged by Debian.
Also consider NetBSD Userland which would be a crunchgen'd suite of common utilities as a more featureful (working) alternative to BusyBox.
Other software to consider but currently have an upstream is bozohttpd, dhcpcd, and openresolv.