Apps like PortKnocker

Here are some great alternatives to PortKnocker by Stephen Paine :
Knock on Ports
Knock on Ports
★4.6
Packet Injection
Packet Injection
★3.8
XTextureExtractor
XTextureExtractor
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Mahjong VirtualTENHO-G!
Mahjong VirtualTENHO-G!
★4.4
Resolution Check (ResCheck)
Resolution Check (ResCheck)
★4.0
Hand fonts for FlipFont
Hand fonts for FlipFont
★3.2
Resolution Changer — Uses ADB
Resolution Changer — Uses ADB
★3.5
Samsung Services (US)
Samsung Services (US)
★3.7
Screen Resolution Changer: Dis
Screen Resolution Changer: Dis
★3.3
Samsung Services (US - Galaxy
Samsung Services (US - Galaxy
★3.7
Screen Size / Info / Dpi
Screen Size / Info / Dpi
★4.3
Pixel Clock Widgets & Themes
Pixel Clock Widgets & Themes
★3.8
DPI Screen Info
DPI Screen Info
★3.6
WIN BIG LCD Digital Watch Face
WIN BIG LCD Digital Watch Face
★4.4
Pixels: Resolution+DPI Changer
Pixels: Resolution+DPI Changer
★4.6
Display Tester Pro Unlocker
Display Tester Pro Unlocker
★4.4