From George Deluca:
Windows text editor with the look & feel of the IBM editor SPF. It has full keyboard customization, including keyboard macros, a full ISPF based command set (both Primary and Line commands) including many extensions and productivity enhancements and extensions to the normal SPF facility. Contains a built in File Manager for input file selection and basic file management needs. As well, a full programmable macro facility is available to allow simple addition of user created Primary and Line commands.
Best duplication of ISPF/PDF functionality on Windows
Not ported to non-Windows platforms (but have not tried under Wine, etc.)
SPFLite almost duplicates perfectly the ISPF/PDF editing experience. In addition, if you need to work with lines and columns, this editor can help you get your work done faster than a standard traditional character-based text editor.