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    You can also store constant data in program memory, rather then SRAM, if you have SRAM space issues and free program memory. See here or here Commented Feb 15, 2014 at 2:09
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    Another great alternative to EEPROM is an SD card. It does take up a few IO ports but if you do need a large chunk of space for, say map data or similar, it can be easy to swap out and edit with a custom program on a PC. Commented Feb 17, 2014 at 14:05
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    People should not be encouraged to use SPI SRAMs or RAM expansions, if they are running low on memory. That's just a waste of money. Choosing a bigger MCU would be cheaper. Beside, the performance could be very poor. One should first make a ballpark estimation: if the estimated RAM usage is too close to the limit, then you're choosing the wrong board/microcontroller/development platform. Sure, good usage (storing strings in flash) and optimization (avoiding using some libraries) can be true game changers. However at this point I see no benefits of using the Arduino Software platform. Commented Sep 2, 2017 at 17:36