Zero Width Shortener vs Short.cm: What are the differences?
Zero Width Shortener: Shorten URLs with invisible spaces. It is a URL shortener that shortens URLs using spaces that have zero width, making them invisible to humans; Short.cm: Custom URL shortener. Shorten, customize and share branded URLs. It provides some advanced features like country/region/mobile targeting, UTM-tags, link expiration/cloaking, team domains, API for developers, free chat and email support.
Zero Width Shortener and Short.cm can be primarily classified as "Link Shortening as a Service" tools.
Zero Width Shortener is an open source tool with 644 GitHub stars and 41 GitHub forks. Here's a link to Zero Width Shortener's open source repository on GitHub.