RadASM is described as 'A free Integrated development environment for Microsoft Windows originally designed for writing programs in assembly language' and is an app in the Development category. There are five alternatives to RadASM for Windows and Linux. The best alternative is Easy code, which is both free and Open Source. Other great apps like RadASM are MASM Builder (Free), SASM (Free, Open Source), Fresh IDE (Free) and ASM Visual (Freemium).
MASM Builder is a free Integrated Development Environment IDE for developing 32-bit Windows programs using the Assembler. MASM Builder contains many useful features which will assist you in creating Windows API based programs.
SASM (SimpleASM) - simple Open Source crossplatform IDE for NASM, MASM, GAS, FASM assembly languages. SASM has syntax highlighting and debugger. The program works out of the box and is great for beginners to learn assembly language.