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   * [konghq.com/](https://konghq.com/) — API Marketplace and powerful tools for private and public APIs. With the free tier, some features are limited such as monitoring, alerting and support.
   * [Kreya](https://kreya.app) — Free gRPC GUI client to call and test gRPC APIs. Can import gRPC APIs via server reflection.
   * [KSoft.Si](https://api.ksoft.si/) — Free lyrics api chiefly aimed for discord bots.Also provides an extensive library of images and user data
+  * [Lightly](https://www.lightly.ai/) — Improve your machine learning models by using the right data. Use datasets of up to 1'000 samples for free.
   * [MailboxValidator](https://www.mailboxvalidator.com) — Email verification service using real mail server connection to confirm valid email. Free API plan has 300 verifications per month.
   * [microlink.io](https://microlink.io/) – It turns any website into data such as metatags normalization, beauty link previews, scraping capabilities or screenshots as a service. 100 reqs/day every day free.
   * [monkeylearn.com](https://monkeylearn.com/) — Text analysis with machine learning, free 300 queries/month.