
Surge XT
Vital
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TAL-NoiseMaker
FluidSynth
ZynAddSubFX is an open source software synthesizer for Linux, Mac OS X and Microsoft Windows.
Smarty
Zipcodestack
PostalDataPI
Geoco.io
Melissa Data Quality
Loqate
usZIPCodes.org
REST API for US ZIP, ZIP+4, and Canadian postal codes. Single unified endpoint covers address validation and standardization, radius search (centroid haversine and true spatial polygon intersection), point-to-point distance, autocomplete/typeah

Which is more popular?
Based on our record, ZynAddSubFX seems to be more popular. It has been mentioned 5 times since March 2021.
Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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| Website | zynaddsubfx.sourceforge.io | zip-codes.com |
| Company | — | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of ZynAddSubFX yet.
API for US ZIP, ZIP+4, and Canadian postal code data. One unified endpoint set covers North America — no separate APIs by country or data type. What it does Address validation and standardization — production-grade parser with ZIP+4 append, refreshed monthly Radius search — centroid haversine and...
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ZynAddSubFX Tutorial & Review, Free, Opensource Synth
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Share your experience with using ZynAddSubFX and ZIP Code API. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

It's not short, but I was introduced to the concept in a video series on FLOSS Linux audio tools: https://www.youtube.com/watch?v=hdPPPeq82hw&list=PLf_MTToSAxRITjUHgpIPUQTZdGvNQR-0p&index=1 Specifically, you can play with it yourself... - Source: Hacker News / over 2 years ago
I've also used ZynAddSubFX, which is also a very powerful synth, though its interface (at least to me) is a bit of a clusterfuck. You could also try browsing this index of microtonally capable synths on the xenharmonic wiki. Source: over 3 years ago
The code for this can be found here on shadertoy! The audio was made with an Ibanez bass, Guitarix, Hydrogen Drums, ZynaddSubFX and Ardour! Source: almost 5 years ago
Tracking ZIP Code API since May 2026.
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Open-source subtractive-hybrid synthesizer formerly sold commercially as Vember Audio Surge.
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Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
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Vital is a spectral warping wavetable synthesizer with drag'n'drop modulation workflow and animated preview of the synth's inner workings where needed. Comes with many modulation sources (including audio-rate), MPE support and FX chain.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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