diff --git a/README.md b/README.md
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@@ -965,6 +965,7 @@ See also https://github.com/n1trux/awesome-sysadmin#it-asset-management
 - [Kresus](https://kresus.org/) - Open source personal finance manager. ([Demo](https://kresus.org/en/demo.html), [Source Code](https://github.com/kresusapp/kresus)) `MIT` `Nodejs`
 - [PartKeepr](https://www.partkeepr.org) - PartKeepr is an electronic part inventory management software. It helps you to keep track of your available parts and assist you with re-ordering parts. ([Demo](https://demo.partkeepr.org/), [Source Code](https://github.com/partkeepr/PartKeepr)) `GPL-3.0` `PHP`
 - [SilverStrike](https://silverstrike.org/) - Personal finance management made easy. ([Demo](https://demo.silverstrike.org/), [Source Code](https://github.com/agstrike/silverstrike)) `MIT` `Python/Django`
+- [Square](https://developer.squareup.com/docs/) - Payment APIs to manage and run nearly all aspects of business including customer, product, inventory, and employee management. `Apache-2.0` `PHP/Nodejs/Ruby/Python/Java/.Net`
 - [StockazNG](https://dev.sigpipe.me/dashie/StockazNG) - Asset Management System. `MIT` `Python`
 
 ## Monitoring