LibXL reads and writes Excel files without COM and Microsoft Excel. It works with large sheets and has a high performance: 2 100 000 cells per second for writing numbers and 240 000 cells per second for writing 8-character random strings (CPU 3.2 GHz). Supports cell's formatting: alignments, borders, colors, fill patterns, fonts etc. Library can be used in C, C++, C# and other languages. It's supplied as DLL and has 32-bit and 64-bit versions.