Enchant 1.6

Enchant is a library used for spell checking. It provides dictionaries, can check if a word is spelled correctly, and suggest corrections for misspelled words. Enchant does not use pipes to communicate with command line programs. Instead, it has a C and C++ API and its backends are small C/C++ plugins.

Enchant appears to be a generic spell checking library. You can request dictionaries from it, ask if a word is correctly spelled, get corrections for a misspelled word, etc.
Enchant does not use pipes to talk with command line programs. Enchant is a full-fledged library, with a C and C API. Its communication with its various backends happens via "virtual function calls", or at least the C equivalent thereof. The backends are small C/C plugins.