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yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
Smarty
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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

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Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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| Website | yworks.com | zip-codes.com |
| Company | Startup from Germany | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of yEd 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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yEd Graph Editor in 90 seconds
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Another excellent tool that you can use for common and complex visual illustration is yEd. This aims to help users in terms of creating diagrams like UML, flowcharts, network diagram, org chart, and other process...
yEd is a desktop application that can be used to quickly and effectively generate high-quality diagrams. Users can create diagrams manually, or import their external data for analysis. yEd’s automatic layout...
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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