QED is a shareware text editor for the HP 48 written in assembly language. It is much faster than the editor built into the HP 48. Includes versions for both the S series and G series.
Redundance Fighter is probably the second most used compression program for the SX/GX. Also includes version 1.21 for the S series, which is necessary to decompress some old RF archives.
Yet another implementation of the Redundance Fighter compressor. For both the S and G series. Also includes an S-series only version with just the decompressor.