Open source and free!
Features:
• Multiple printers
• Slicing
• Upload/Download Files
• Temperature Graph
• Printer Controls
• Connect/Monitor
• Webcam (experimental)
• Notifications
• Terminal console
Since OctoPrint is fully open source, it would not be right if OctoAndroid wasn't either. All the code is located on GitHub here: https://github.com/nairbspace/octoandroid
OctoAndroid is still a big work in progress. Contact via email below, submit enhancement issue on GitHub, or vote here for next feature: https://www.surveymonkey.com/r/RF8HLBZ
Disclaimer: This is a 3rd party app and is not directly affiliated with OctoPrint.