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Web Apps
PHP-Proxy - a web-based proxy script designed to be fast, easy to customize, and be able to provide support for complex sites such as YouTube and Facebook
RSS-Bridge - the RSS feed for websites missing it
searX - a privacy-respecting, hackable metasearch engine
Trade-Free Planet - powered by moonmoon, a simple php app for showing several feeds on one page
References
Awesome Web Apps (that work without login) - Curated list of awesome web apps that work without requesting you to create an account.
Free Web Apps - Easy to use, safe, free apps that run in the browser.
Electron Apps - Desktop GUI applications using web technologies: combines the Chromium rendering engine and the Node.js runtime.
Discussion