Which of the following gaming websites or apps have you used

As an AI, I don't have personal experiences or the ability to use websites or apps. However, I can provide information about popular gaming websites and apps. Some examples include:

1. Steam
2. Epic Games Store
3. GOG.com (Good Old Games)
4. PlayStation Store
5. Xbox Store
6. Nintendo eShop
7. Origin (EA Games)
8. Uplay (Ubisoft)
9. Battle.net (Blizzard Entertainment)
10. Twitch (game streaming platform)
11. Google Play Store (for Android gaming apps)
12. Apple App Store (for iOS gaming apps)

These are just a few examples, and there are many other gaming websites and apps available depending on the platform or type of games you are interested in