Webshot - Free and Open Source screenshot website service
Shottr - Shottr is a free macOS screenshot app with scrolling screenshots, OCR, annotation and measurement instruments.
Thum.io - A real-time website screenshot generator
Full Page Screen Capture - I built a Chrome Extension that allows you to save a screenshot of an entire webpage as an image
Scrola - Create scrolling website screenshots, easily
LambdaTest - Perform Web Testing on 2000+ Browsers & OS