Graphic Set Tool
Official Game Conversions
My Level PacksLemmings Plus Series
Obsolete NeoLemmix Tools
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NeoLemmix Flexi Toolkit
Flexi Toolkit is a tool which helps you take NeoLemmix levels and other content you've made, and put them together into an NXP file which can be run by the NeoLemmix Engine. You can include more than just custom levels - you can have custom menu graphics, custom music, even custom lemming sprites.