Add Labelixa to APIs, Data, and ML

Free ZPL label rendering/validation API. Works without a key (anonymous quota); an API key is optional and raises limits. HTTPS and CORS supported. Docs: https://labelixa.com/docs/api

README.md

@@ -305,6 +305,7 @@ This list results from Pull Requests, reviews, ideas, and work done by 1600+ peo
   * [JSONSwiss](https://www.jsonswiss.com/) - JSONSwiss is a powerful online JSON viewer, editor, and validator. Format, visualize, search, and manipulate JSON data with AI-powered repair, tree view, table view, code generation in 12+ programming languages, convert json to csv, xml, yaml, properties and more.
   * [KillBait API](https://killbait.com/api/doc) - KillBait API allows users to submit URLs for content evaluation, detecting potential clickbait and categorizing articles. The API is designed for moderate publishing frequency, with limits of 1 submission per hour and 10 per day. Media partners can request higher limits.
   * [Kreya](https://kreya.app) - Free gRPC GUI client to call and test gRPC APIs. Can import gRPC APIs via server reflection.
+  * [Labelixa](https://labelixa.com) - Zebra ZPL label rendering and validation API and browser viewer. Free tier includes an anonymous rendering quota and barcode generation with no watermark, no card required.
   * [LayerCall](https://www.layercall.com) - Fraud and trust scoring for an IP, email, phone, domain or device in one call, plus authorization and Web Bot Auth verification for AI agents. 1,000 lookups/month free, no card required.
   * [LoginLlama](https://loginllama.app) - A login security API to detect fraudulent and suspicious logins and notify your customers. Free for 1,000 logins per month.
   * [Market Data API](https://www.marketdata.app) - Provides real-time and historical financial data for stocks, options, mutual funds, and more. The Free Forever API tier allows for 100 daily API requests at no charge.