ztex is a firmware Kit with a corresponding Driver API which is especially designed for the ZTEX Modules but which should work with all other EZ-USB based hardware. The Firmware Kit is written in C and assembled using a powerful macro processor. This allows you to specify all required settings using by a few commands. The necessary USB descriptors and the descriptor handling routines are generated automatically. The package runs under Linux and Windows (porting to other operating systems should be no problem). The Java driver API allows the development of platform-independent device drivers.
fpgasm creates bare-metal FPGA designs without Verilog or VHDL. Traditionally, FPGAs are built using proprietary Verilog or VHDL language implementations provided by the vendor. fpgasm is to Verilog and VHDL as assembly language is to C++. It takes you all the way to the netlist, and is not just a translator to Verilog. Because of that, the total "make" time to a working fpga is seconds, not minutes. With fewer than ten reserved words, fpgasm syntax can be mastered in a few minutes. With FPGA assembler, you can focus on understanding the FPGA substrate and how your design should map onto it (instead of figuring out large and complicated tools).