Compilers
Castle C/C++ Development Suite, Desktop Fortran 77, Easy C++, GCC Software Development Kit, LCC
Development Tools
!dBoxTools, AppBasic, ARMalyser, Concurrent Versions System (CVS), DiffTB, Diodesign Software, Dr Smith's Professional C Development Toolkit, Dr Wimp, Inform 6, LCLint
Libraries
32-bit Porting Support, A 3D Engine, Ada, DeskLib, ExtrasLib, FDSound, IFCLib, Kappa - BASIL, MalCheck, Mesa
Utilities
BForm, CommandBASIC, DoggySoft Software, Enla, HelpFrame, Leo Smiers, ModInfo, Wonderworks
32-bit RISC OS
Developer support for the Iyonix PC from Castle Technology.
AcornCD
A CDDB server for RISC OS. Includes programming specifications and demonstration program.
Arm Sort
Module which provides BASIC programmers with fast facilities for sorting arrays.
ArmBob
Interpreter for a variant of Bob, a small object-oriented programming language. Documentation, examples, and source.
Basalt
Extends BASIC with new keywords. List of features, manual, and downloads.
Basil
Shares BASIC libraries between programs. Overview, manual, and download.
C Programming Information
Guide to C programming on RISC OS. Documentation and tutorials, compilers, libraries, and downloads.
Fortran Friends
A user group for Fortran on RISC OS. News, information on compilers and libraries, and list of products.
Gofer
RISC OS port of the Gofer interpreter for Haskell, a lazy functional language.
Hugs
http://www.drobe.co.uk/archives/?directory=/ftp.uni-stuttgart.de/pub/systems/acorn/acornet/long/deve
RISC OS port of the Hugs interpreter for Haskell, a lazy functional language.
Java
Perhaps the definitive source for using Java and related applications under RISC OS.
Lua
Two implementations of Lua for RISC OS. Downloads, documentation, and examples.
PHP
RISC OS port of the HTML-embedded scripting language. Interpreter and StrongHelp manual.
Python
Binaries of version 2.3, RISC OS specific modules, and a "Getting started" guide.