The Android ecosystem contains thousands of applications, but not every useful tool needs to be closed source or dependent on a proprietary cloud service.
For this video, I selected three open-source Android applications that provide practical functionality while giving users access to their source code.
I tested the applications on my Redmi Note 7 Pro running MatrixxOS based on Android 16 QPR2.
Watch the Video
I've demonstrated all three applications in the accompanying TechyNoob video.
Why Open Source Matters
Open-source software allows the source code to be inspected, modified and redistributed according to its license.
That doesn't automatically make an application secure, but it gives developers and technically capable users the opportunity to inspect how the software works.
It can also make projects more transparent about their functionality.
App 1: RvSystem Monitor
RvSystem Monitor is designed for users who want more information about what their Android device is doing internally.
A system-monitoring application can be useful when troubleshooting performance, checking resource usage or simply learning more about a device.
For Android enthusiasts running custom ROMs, monitoring tools can provide additional information that isn't always visible through the standard Settings interface.
Developer credit:Rve27 on GitHub
App 2: Primitive FTPd
Primitive FTPd provides FTP/FTPS/SFTP-related file-transfer functionality on Android.
This can be useful when transferring files between a phone and another device without physically connecting a USB cable every time.
However, file-transfer protocols should be configured carefully, particularly when the server is accessible over a network that contains untrusted devices.
Developer credit:wolpi on GitHub
App 3: AFWall+
AFWall+ is a firewall application for Android that uses the Linux firewall infrastructure available on rooted devices.
It can provide per-application network-control options, allowing users to decide which applications should have network access.
This can be particularly useful for privacy-conscious Android users who want greater control over background network traffic.
Developer credit:ukanth / AFWall+
My Testing Setup
All three applications were tested on:
Device: Redmi Note 7 Pro
ROM: MatrixxOS
Android: Android 16 QPR2
The experience of these applications can differ significantly depending on whether the phone is rooted, which Android version is installed and what permissions are available.
Privacy Considerations
Open-source applications can be valuable from a transparency perspective, but permissions still matter.
For example, a file-transfer application needs network functionality, while a firewall needs much deeper access to control application traffic.
Always review permissions and understand why they are necessary.
Pros and Cons
Pros
- Open-source projects
- Useful for Android enthusiasts
- Greater transparency
- Several practical use cases
- Particularly useful on rooted/custom-ROM devices
Cons
- Some features require elevated permissions
- Setup may be more complicated than mainstream applications
- Open source doesn't automatically guarantee security
- Compatibility depends on Android configuration
Final Verdict
These three applications demonstrate why open-source software remains important in the Android ecosystem.
RvSystem Monitor is aimed at users interested in device information, Primitive FTPd is useful for network-based file transfers, and AFWall+ provides more control over application network access.
Rather than installing all three simply because they are open source, choose the application that solves an actual problem for you.
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