Rasterbator is described as 'The Rasterbator creates huge, rasterized images from any picture. Upload an image, print the resulting multi-page half-toned pdf file and assemble the pages into extremely cool looking poster up to 20 meters in size' and is an app in the Photos & Graphics category. There are more than 10 alternatives to Rasterbator for Windows, Online / Web-based, Mac, Linux and SaaS. The best alternative is pdfposter, which is both free and Open Source. Other great apps like Rasterbator are Posteriza (Free), Lucidpress (Freemium), Posterizer (Free) and Separation Studio (Paid).
This requires the installation of Python and pyPDF. Out of the gate, the script does not provide for image overlap, however there is a patch that does fix this. The patch requires replacing 5-6 lines in 3 files and adding 2-3 new ones, its very easy.
Posterizer's free online rasterbator allows you to create posters larger than a standard page, using the tiled printing method. It will rasterize any image and output files that can be printed at home and reassemble to the original image.