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The '''NIRVANA Engine''' is a 'bicolour' (multicolour 8×2) graphics engine written by [[User:Einar|Einar Saukas]], supporting graphics using 22 character rows and 30 character columns. It's open source and royalty-free (even for commercial programs). Further details can be found in [http://www.worldofspectrum.org/forums/showthread.php?t=45538 this thread]. The latest version is available for download [http://www.worldofspectrum.org/forums/showpost.php?p=739791&postcount=122 here].
It natively supports all standard Spectrum models (48K, 128K, +2, +2A, +2B, +3). There's also an unofficial (partial?) port for Pentagon machines, as described [http://www.worldofspectrum.org/forums/showthread.php?p=762586#post762586 here].
List of released games using the '''NIRVANA Engine''':