Plink.gg is described as 'The cross-platform application for full immersion in the game world. Call up, prepare to play, find worthy opponents and track the game progress of your friends'. There are three alternatives to Plink.gg for Online / Web-based, Android and iPhone. The best alternative is OpenDota, which is both free and Open Source. Other great apps like Plink.gg are Dotabuff (Free) and Tracker.GG (Free).
OpenDota is a volunteer-developed, open source platform providing Dota 2 data. It provides a web interface for casual users to browse through the collected data, as well as an API to allow developers to build their own applications with it.