AutoSizer is described as 'automatically resizes programs for you, keeping them at a specific size or keeping them maximized. One popular use is to keep Internet Explorer maximized when you go on the web' and is an app in the OS & Utilities category. There are more than 25 alternatives to AutoSizer for Windows and Windows Explorer. The best alternative is Actual Window Manager. It's not free, so if you're looking for a free alternative, you could try Sizer or Preme for Windows. Other great apps like AutoSizer are WindowManager (Paid), MaxTo (Paid), Always on Top (Free) and SmartSystemMenu (Free, Open Source).
Sizer is a freeware utility that allows you to resize any window to an exact, predefined size. This is extremely useful when designing web pages, as it allows you to see how the page will look when viewed at a smaller size.
MaxTo is a small Windows program that divides your monitors into regions. When you maximize a window, it will no longer fit the entire screen, but only the region it was maximized into. Your windows are neatly organized into the grid you have defined when they are maximized.
Ever try to size a window so it just touches the edge of the screen? It’s tedious (at least for me). FreeSnap allows you to instantly resize any window edge to the corresponding screen edge. Want that window to touch the right edge of the screen?
reSizer is a system utility that enables keyboard shortcuts to focus, move, resize and change other window properties in a fast and intuitive way without even touching the mouse. Features: Keyboard shortcuts for moving and resizing active windows.