It happened that I came across a set of numbers and wanted to sum them up. So, I've created this calculator - you just drop integer numbers in there, then press the Calculate button and get the resulting sum. I think it is a bit more useful than the standard windows calculator since you can easily tweak numbers in the list and recalculate the sum. Also, you do not need to open a spreadsheet program and enter numbers (you don't even need to have a spreadsheet program). And, finally, it accepts any non-digit (well, except minus and plus signs) as a numbers separator.
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