This page lists the extra libraries that are part of the Maple IDE (along with the rest of libmaple). You can use a library from within a sketch by going to Sketch > Import Library... from within the IDE, then choosing the library you want.
Any incompatibilities between the Maple and Arduino versions of a library are noted in the library’s documentation.
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The LiquidCrystal library allows Maple to control LCD screens. For more information, see the Arduino LiquidCrystal documentation.
At this time, no incompatibilities between the Maple and Arduino versions are known (although the Maple version should perform significantly faster). Any observed differences should be considered bugs, and reported on the forums.