Third-party logic

Software, firmware, or hardwired logic that is neither application logic nor COTS [Commercial Off-The-Shelf (COTS) technology]. This includes, for example, general-purpose software developed by a third party that is either customized (for example, ported to a new platform, as is Windows Embedded Compact), not widely used, or source-code generated by a COTS package.

Source: Election Terminology Glossary - Draft, National Institute of Standards and Technology (NIST),