SFXR is described as 'Sfxr is a program that specializes in making chiptune sound effects for video games. Its interface consists of sliders that change the shape of the wave as well as the envelope and pitch. It has the ability to export to WAV for use in other programs' and is an website in the Audio & Music category. There are more than 10 alternatives to SFXR, not only websites but also apps for a variety of platforms, including Linux, Windows, Self-Hosted solutions and Mac. The best alternative is bfxr, which is both free and Open Source. Other great sites and apps similar to SFXR are LabChirp (Free), ChipTone (Free), sfxia (Free) and rFXGen (Freemium, Open Source).
Bfxr is an online version of sfxr, a chiptune sound effects generator. The interface is more or less the same as sfxr. Some additional features have been added to this version such as 5 new waveforms, 3 new filters, a mixer, and more.
rFXGen is a simple and easy-to-use fx sounds generator, based on the amazing SFXR. Sounds could be saved as .rfx (sound generation parameters) and also exported to .wav as sample data, defining sample formatting.
Industrializer is a program for generating percussion sounds for musical purposes. This program is great for generating new techno and industrial sounds. It also can produce chimes, bubbles, gongs, hammer hits on different materials and so on.
This app is a random midi melody generator which you can use to create melodies. The melodies are procedurally generated and are royalty free. You are free to download the midi files and use them in your own music.
wafxr is a sound effect generator in the tradition of as3fxr, bfxr, jfxr, and others. But where such tools normally generate static files, this one plays sounds dynamically via Web Audio. Supports oscillators, FM synth, tremolo/vibrato, and various other filters and effects.