xlnt 
 Spreadsheet library
 A C++ library for manipulating spreadsheets in memory and reading/writing XLSX files
 Cross-platform user-friendly xlsx library for C++11+
2k stars
 78 watching
 423 forks
 
Language: C++ 
last commit: about 1 year ago 
Linked from   1 awesome list  
  apic-plus-pluscppexcelmicrosoftreadspreadsheetwritexlsx 
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