WOUM
- C and assembler library with source for fixed point maths, 3D graphics, WIMP programming, fast sprite plotting, debugging, and profiling. Download and discussion forums.
- http://www.coderscauldron.com/woum/

Wimp2
- An alternative multitasker which preemptively multitasks the application rather than cooperatively as the current RISC OS Wimp does. Downloads and brief overview.
- http://www.nedprod.com/programs/RISC-OS/Wimp2/

OSLib
- Interface library to the RISC OS API. Summary, FAQ, and downloads. [Open source]
- http://ro-oslib.sourceforge.net/

StubsG
- C-library neutral libraries including TCPIPLibs, RISC_OSLib, C library, flexlib, and Toolbox libraries, as well as the SharedCLibrary neutral StubsG. This allows applications and modules linked against it to be used with which ever version of the SharedCL
- http://support.riscos.com/Support/Resources/Libraries/StubsG/

IFCLib
- Library for interfacing to the Select 3 'ImageFileConvert' module stack. This system allows images of one type to be converted to another through a single SWI interface.
- http://support.riscos.com/Support/Resources/Libraries/IFCLib/

Python Resources
- A variety of scripts and libraries for the Python language.
- http://www.boddie.org.uk/david/Projects/index.html

32-bit Porting Support
- 32BitLib is a macro library for BASIC assembler. Armc is a perl script to semi-automate conversion.
- http://www.mw-software.com/software/32bitlib/32bitlib.html

Kappa - BASIL
- Allows the use of the same BASIC code for many programs without having to load new copies each time, by loading libraries into the relocatable module area. Freeware program, available for download along with manual.
- http://www.users.zetnet.co.uk/kappa/basil.htm

MalCheck
- Helps track down program errors involving dynamically allocated memory blocks.
- http://www.xs4all.nl/~erikgrnh/riscos/malcheck.html

ExtrasLib
- Minor C library of extra code for users of DeskLib.
- http://utter.chaos.org.uk/~pdh/software/extras.htm

Ada
- Class library for this third-generation programming language.
- http://www.huber-net.de/adalin_e.htm

RiscXLib
- Set of libraries that allow X client programs to be compiled and run with little or no changes to the source code.
- http://www.brighteyes.u-net.com/RiscXLib/RiscXLib.html