FMOD is a software development kit (SDK) designed for audio processing and sound effects. Some synonyms for FMOD include other audio processing and sound effect SDKs such as Wwise, OpenAL, and SDL Mixer. Additionally, game engines such as Unity and Unreal Engine have built-in audio processing and sound effect systems. While these alternatives may offer similar features to FMOD, each SDK has its own strengths and weaknesses, ranging from ease of use to flexibility. Ultimately, the choice of SDK will depend on the specific needs of the project and the expertise of the development team.