v1.4.4 is the last build that supports Windows XP. Starting with v1.4.5, the Windows build will only support Windows 7 and newer. V1.4.7 is the last version of CoolTerm available as a universal binary supporting OS X 10.6 or older, click here to download. Please use the forums to share your experiences with other users. Please use these builds at your own risk. The LINUX and Raspberry Pi builds have been posted here as a courtesy to the users that asked for it. While almost everything is expected to work as expected, only minimal testing using virtual machines has been performed to confirm that all the features work properly. The LINUX and Raspberry Pi versions are not 'officially' (meaning: 'not well') supported. All newer versions will only be available as 64-bit builds.
Note that version 1.7.0 is the last 32-bit build for macOS. The 32-bit builds are still available and can be downloaded here: Win / Linux Starting with version 1.6.0, the default for all platforms (except Raspberry Pi) is 64-bit. CoolTerm is a simple serial port terminal application (no terminal emulation) that is geared towards hobbyists and professionals with a need to exchange data with hardware connected to serial ports such as servo controllers, robotic kits, GPS receivers, microcontrollers, etc.