Jasmin is a Java Assembler. It takes ASCII descriptions for Java classes, written in a simpleassembler-like syntax. It converts them into binary Java .class class files suitable for loading into a Java Virtual Machine implementation.
PowerMSX is a modern assembler/debugger/simple C interpreter/compiler for the Z80 computer based MSX. This assembler and C interpreter/compiler will be much better/easy than the actual m80/l80 assembler (then only free available for Z80 - MSX).