
Description: Randoku is a free, open-source Sudoku puzzle generator. It creates randomized, solvable Sudoku boards of varying difficulty levels that can be printed or used in games and apps. Randoku uses constraint programming algorithms to ensure logically valid puzzles.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Diigo is a social bookmarking website that allows users to bookmark web pages and highlight or annotate parts of the pages. Users can categorize their bookmarks, search through bookmarks, and access bookmarks from any computer.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API