The Nicomsoft OCR SDK is also available for Linux (x86 and x64). Here are some notes about the Linux version:
The scan functions ("Scan_XXXXX") are not available.
Asian OCR module is not available.
By default, an EXE that calls "libNSOCR.so" must be placed in the "Bin" folder (that is, in the same folder). If you need to specify a different location for the OCR files, use the "Engine_SetDataDirectory" function.
All OCR functions use wide characters. In Linux, a wide character is 4 bytes.