Google Play is great to download apps but it obviously doesn't have absolutely everything. For instance, you can only find totally legal apps, no pirate apps or mods that skip the restrictions of the original version. If you're looking for a full version of Spotify without ads or a Netflix that works without paying, you definitely won't find them in the Play Store. Mankind is curious by nature and precisely these two examples are the most demanded tools by an audience that doesn't want to pay a cent for anything. You probably already know a few alternative app stores, but here's another one: AppValley.
Here you can find thousands of modified apps to obtain advantages regarding the official versions. You can get hold of messaging apps that don't delete messages after a few seconds, image editors without limitations when it comes to using all their filters and brushes or games with endless money. Basically, anything you could do with an iPhone with a jailbreak, but now on Android by simply installing this APK.
An alternative to TutuApp and similar apps
If you haven't got enough with the contents you can find in the official Android marketplace or you're looking for an alternative to other app stores of the likes of TutuApp to name just an example (the truth is that there are dozens of them out there now), try downloading AppValley, the Android version that will allow you to boast in front of your friends about the exclusive apps you've installed.