OTItemEditor is a program used to edit the OTB data files used by OpenTibia servers and tools to map the item IDs used by the client to a consistent set of IDs used by the server and tools. This is necessary since CIPSoft changes the client-side IDs every major version released and remapping of them is required.
This tool can read the Tibia.dat / Tibia.spr files distrbuted with the client and either match them up with the server-side IDs via image recognition and also add new items to the data files.
There are no builds of OTItemEditor available at the moment.
You can build the project using the provided otitemeditor.sln in Visual Studio 2010 or later.
If somebody can contribute compiling instructions for other platforms, that'd be great.
If you find a bug use the bug tracker on github to report it.
The easiest way to contact the developers is to post to the forums at otfans.net.
OTItemEditor is made available under the GPLv2 License, this means that forks of the project must be distributed with sources available.