Evaluator is described as 'audio creation app that lets you write short C-style programs whose output is used to generate sound! It's available as a standalone app or as a VST plugin for your DAW' and is an app in the Audio & Music category. There are more than 10 alternatives to Evaluator for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Mac, Windows and Linux. The best alternative is SuperCollider, which is both free and Open Source. Other great apps like Evaluator are Sonic Pi (Free, Open Source), Synthesine (Free, Open Source), ChucK (Free, Open Source) and Faust (Free, Open Source).
AudioMasher is a live, in-browser audio and music programming environment. The app is based on the Sporth audio programming language by Paul Batchelor, is open-source and can be used online or via self-hosting.
The SOUL platform is a language and an API. The language is a small, carefully crafted DSL for writing the real-time parts of an audio algorithm. The API is designed to deploy that SOUL code to heterogeneous CPUs and DSPs, both locally and remotely.
Gibber is a creative coding environment for audiovisual performance and composition. It contains features for audio synthesis and musical sequencing, 2d drawing, 3d scene construction and manipulation, and live-coding shaders.