Srecord-1.20 is a very useful tool for manipulating various ASCII/HEX/BINARY files for creating EPROM images check http://srecord.sourceforge.net/ for the latest information.
Source: srecord-1.20.tar.gz
Documentation: srecord-1.20.pdf
Source: srecord-1.23.tar.gz
Documentation: srecord-1.23.pdf
RCASM is the assembler needed by several of the Makefiles to build the BIOS
Source Zip File: rcasm.tgz