This is a simple command line IP-Changer for old Tibia clients. Its main feature is having multiple server configurations stored in a configuration file (see ipchanger.exe -help). Only a few client versions are currently supported (7.7, 7.72, 7.92, 8.1, 8.6) but it should be straighforward to expand to others. There is also a memory scan tool that can be used to help with scanning memory addresses for yet unsupported clients.
Both are Windows specific and can be compiled by running build.bat from the visual studio shell. They're very simple so I wont bother explaining them further. For more details, the source code should be very readable.