Best free apps?

[Successor]

Hi Guys,

I have Android Tablet. The version it has is 6.0.1.I am new to it. I want to know the best free software for the following.

1. Anti-Virus (with Firewall)

2. PDF Reader (with faster search results for Particular words.)

3. Eraser (for secure erasing)

4. Free Space Cleaner

5. App Lock

6. Folder Lock


You may recommend any other apps which you have found useful.

 

[MuseBellamy]

I don't like too much tools app in my phone, so I can only help you with 5 and 6.
5- AppLock -https://play.google.com/store/apps/details?id=com.domobile.applock this one is most download, and small size only 3.6M. lock apps, incoming calls, datas.
6- ES file https://play.google.com/store/apps/details?id=com.mwgo.filelocker this one is better

 

[Maikgarberd]

Hi Guys,

I have Android Tablet. The version it has is 6.0.1.I am new to it. I want to know the best free software for the following.

1. Anti-Virus (with Firewall)

2. PDF Reader (with faster search results for Particular words.)

3. Eraser (for secure erasing)

4. Free Space Cleaner

5. App Lock

6. Folder Lock


You may recommend any other apps which you have found useful.

I don't use all of the apps you shared here. But Anti Virus, PDF Reader and App Lock is much interesting.