Opttech.com (formerly Opt-Tech Data Processing) 

Makers of Opttech Sort  High Performance Sort/Merge/Select Utility For Windows & Other Operating Systems.                                  

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Opttech Sort is a High Performance Sort/Merge/Select Utility.  Available for Windows, DOS, Linux,  and UNIX platforms. 

Usable as a stand-alone utility or callable from your programs. 

For over 27 years programmers and non-programmers have relied upon Opttech Sort.