This mod is very simple. All it does is change the title of the Minecraft window.
The text it sets the title to it gets from the configuration file. Just launch the game once to generate the default config, and edit to fit your needs.
There are a few replaceable inputs, too.
Always visible:
%mcver% will be replaced with the current version of Minecraft
%modcount% will be replaced with the number of loaded mods
%time% will be replaced with the current system time (Time format can be changed in the config file)
Visible while ingame:
%playerloc% will be replaced with the current XYZ coordinates of the player
%chunk% will be replaced with the chunk index
%biome% will be replaced with the current biome
%score% will be replaced with the player's current score (the amount of XP collected since the last respawn), because why not
Values that are only visible while ingame are replaced with a configurable placeholder (default: --) when in the main menu.
If you have any suggestions for the mod, feel free to submit an issue in the issue tracker, and I'll see what I can do.