APKLinker is described as 'has download links of popular Android Apps. You can just sideload your favorite android app. Either it's final, beta or alpha, you can get all variants of android apps here'. There are more than 25 alternatives to APKLinker, not only websites but also apps for a variety of platforms, including Android, Android Tablet, Android Wear and Kindle Fire. The best alternative is Google Play Store, which is free. Other great sites and apps similar to APKLinker are Aptoide (Free, Open Source), APKPure (Free), APKMirror (Free) and Uptodown (Free).
Aptoide is a distributed marketplace for mobile applications which runs on the Android operating system. In Aptoide, unlike the default Google Play Store, there is not a unique and centralized store but each user manages their own store.
In an effort to make things easy, and maybe even fun, AndroidPolice.com created APK Mirror. Over the past several months, they've been working to build a smooth, reliable, trust-worthy site to host the downloads users love. You also can upload APKs to the site yourself.