OAMP stands for (O)penBSD + (A)pache + (M)ySQL + (P)ostgreSQL + PHP. It is the OpenBSD cousin of LAMP, except that it also provides the SQlite database engine, Perl, Ruby, and Python. In addition, OAMP provides phpMyAdmin and phpPgAdmin for easy administration of MySQL and PostgreSQL over the Web.
NSFileHandleExt is an Objective-C extension (Cocoa/GNUstep) for the NSFileHandle class (which handles files/sockets). This extension provides support for much easier network programming for protocols like HTTP, IRC, telnet, etc. (everything that sends messages in lines suffixed by \n).
dpkg-du is a script to produce a dump of the installed size of Debian packages in du format. This is to enable ease of reuse with pre-existing scripts administrators may have to deal with 'du' format lists. For example, dpkg-du|sort -n|tail -10 will show the 10 biggest packages on your system.
pgpool is a connection pool server for PostgreSQL. pgpool runs between PostgreSQL's clients (front ends) and servers (back ends). A PostgreSQL client can connect to pgpool as if it were a standard PostgreSQL server. pgpool caches the connection to a PostgreSQL server to reduce the overhead to establish the connection to it. Also, pgpool can use two PostgreSQL servers for fail over. If the first server goes down, pgpool will automatically switch to the secondary server. Moreover, pgpool supports scheduled switch over.