RealMedia Utilities

Inspired by a similar thread in Doom9 though I'll only be listing here the tools I personally use w/ biased ratings ;-)

Encoding (frontend)

Easy RealMedia Producer v1.94 & Editor v1.73 by redcheek
☆☆☆☆☆
The one and only :-)
[ Download ] [ Mirror ] (by Tekoo)

You could download Helix Producer SDK from the Helix Community and use its libs instead since they're more updated.

General (info, fix^[1], sync, mux, demux, etc.)

RealMedia Analyzer v0.30.00 by Alexey Pavluchenko
☆☆☆☆☆
Command-line. You must have this ;-)
[ Download ]

RM-Fix v4.6b0923 by Magic Mysery
☆☆☆☆
Command-line but also has text UI
[ Download ]

dtdrive v6.0.9.636 by the Helix Community
☆☆
Command-line. Might be confusing to use; Lacks documentation
[ Download ] [ Info ]

^[1] Fix seek errors (in realplayer mostly), broken index, timestamp errors but not automagically "fix" blurred/pixelated frames. You could discard them though.

Others

RMVB SubtitleMuxer v1.0 by Dark-Cracker
☆☆☆☆
For soft-subbing
[ Download ] [ Info ]

Display Size Changer by redcheek
☆☆☆
Change aspect ratio or video resolution
[ Download ] [ Info ]

RMVB Analyser v1.1 by dark-angel
☆☆☆
Dumps realmedia info (like rma -d) and shows bitrate histogram :-)
[ Download ]

If you need help in using any of the tools, tell me and I'll try to help :-)