RPG Maker VX is a version of PC program RPG Maker series. It has been superseded by RPG Maker VX Ace, which is an enhanced version of RPG Maker VX.

Both RPG Maker VX and RPG Maker VX Ace are developed by Enterbrain, following its precursor, RPG Maker XP.

RPG Maker VX follows the naming pattern present in previous RPG Maker releases by having a suffix based on the Windows version the software was designed for (in this case, Windows Vista and Windows XP).

Here are the RPG Maker VX Ace Minimum Requirements

CPU: Intel Pentium 4 or AMD Athlon XP

CPU Speed: 2.0 GHz

RAM: 512 MB

OS: Windows XP

Video Card: 1024 x 768 resolution

Sound Card: Yes

Free Disk Space: 400 MB

Here are some of the improvements of RPG Maker VX Ace over its predecessor are:

Introduction of RGSS3, which is an improvement over VX's RGSS2.
Integrated character generator.
The return of unlimited tilesets.
Add a third layer to maps to allow for more tiles stacked on top of each other.
The Ruby interpreter is updated to 1.9 from VX's 1.8.3 which has significant speed improvements in processor intensive tasks.
Improved Event and Mapping Systems.
Region ID's.
Traits System.
Easy Shadow control.
Window color changer.
Party caterpillar system.
Character descriptions.
A battle background generator.
Support for Ogg Theora video playback.