Extral

• Extra list manipulation commands
• Mathematical commands on whole lists
• Extra string manipulation commands
• Extra array manipulation commands
• Command manipulation commands
• Validation commands: isint, isdouble
• Maps: store structured data in lists
• Filing commands
• Info commands
• Date and time: extra commands for handling dates
• atexit: execute commands when Tcl exits
• tempfile: get names for temporary files
• Structures
• Convenience functions: various useful procs
• ssort: enhanced lsort