Jettyplay

Jettyplay is a program designed for playing back "ttyrecs", or terminal recordings. It is written in Java (specifically, version 7), to enable it to be used by nontechnical users without requiring a separate compilation step or knowledge of how to use the command line. Additionally, it has more features than the vast majority of ttyrec players: for instance, it can load ttyrecs in the background (meaning that there is no need to wait for the entire ttyrec to parse before playing it), without sacrificing the ability to seek or rewind.

Many features of jettyplay (in particular, playlists) are currently unfinished; as such, it should be treated as alpha-quality software. However, the many features that do work typically work quite well.

To run jettyplay, provide the precompiled binary (or a binary you compile yourself) to a Java 7 runtime. This can normally be done via double-clicking on it in a GUI (marking it executable if necessary for the operating system). Alternatively, from the command line, run

java -jar jettyplay.jar

Jettyplay resources:

Jettyplay has a source repository (accessible via darcs; type darcs clone http://nethack4.org/media/jettyplay);
You can also download a precompiled binary (source is included, just treat it as a ZIP file).

Ttyrec recorders:

The original ttyrec recorder is ttyrec.
However, I recommend the more modern termrec because it records more information.
There is also a modified version of ttyrec, ttyrec2, that also records input; jettyplay can also replay ttyrec2 files. (Be careful not to record your password!)

Other ttyrec players:

IPBT was the recommended ttyrec player for a long time (although it only runs on Linux/UNIX, and it struggles with Unicode);
termrec also provides a player, termplay.