EWARM professional C compiler and debugger.There is a free kickstart version which is with an unlimited assembly language and a 32K limit for C code from IAR Systems AB Sweden. Tested to work with H-JTAG RDI151 and our ARM-JTAG. The flash download to our LPC2138 board shows about 30% slower flash programming than the expensive USB J-Link adapter from Segger. According to IAR Systems their EW-ARM is the benchmark leader.
CrossWork for ARM IDE and debugger on top of GCC from Rowley Associates, this is the very first package to support smoothly Wiggler and ARM-JTAG.
OCDeamon toolchain and debugger from Macraigor Systems. Quite unstabile software, when it wants to work it works, when it doesn't want to work it doesn't. It is too dependant on computer CPU speed, parallel port settings etc. Macraigor is the original developer of Wiggler, but after the Wiggler clones flooded the internet they don't quite support this product.
WinARM - easy to install open source GCC toolchain by Martin Thomas. Lots of examples for our LPC boards are included in the installation. Simple tutorial on how to setup our ARM-JTAG you can find here.