Just add the following in the <keyboard> section of your /.config/openbox/rc.xml and restart Openbox.
<keybind key="W-S-h">
<action name="MoveResizeTo">
<x>0</x>
<y>0</y>
<width>1/2</width>
<height>1/1</height>
</action>
</keybind>
<keybind key="W-S-l">
<action name="MoveResizeTo">
<x>-0</x>
<y>0</y>
<width>1/2</width>
<height>1/1</height>
</action>
</keybind>
<keybind key="W-S-k">
<action name="MoveResizeTo">
<y>0</y>
<width>1/2</width>
<height>1/2</height>
</action>
</keybind>
<keybind key="W-S-j">
<action name="MoveResizeTo">
<y>-0</y>
<width>1/2</width>
<height>1/2</height>
</action>
</keybind>
<keybind key="W-S-h">
<action>
<x>0</x>
<y>-0</y>
<width>1/2</width>
<height>1/2</height>
</action>
</keybind>
Super(win) + Shift + Vim keys hjkl are used to resize and move the windows.
Note: Some terminals such as URxvt doesn't support per pixel resizing, but others such as Terminator and ST with this patch supports it.
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