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2. Data validation - Wikipedia

   en.wikipedia.org/wiki/Data_validation

   For example, an input box accepting numeric data may reject the letter 'O'. File existence check Checks that a file with a specified name exists. This check is essential for programs that use file handling. Format check Checks that the data is in a specified format (template), e.g., dates have to be in the format YYYY-MM-DD.

3. Lotus 1-2-3 - Wikipedia

   en.wikipedia.org/wiki/Lotus_1-2-3

   Lotus 1-2-3 is a discontinued spreadsheet program from Lotus Software (later part of IBM).It was the first killer application of the IBM PC, was hugely popular in the 1980s, and significantly contributed to the success of IBM PC-compatibles in the business market.

4. VisiCalc - Wikipedia

   en.wikipedia.org/wiki/VisiCalc

   VisiCalc ("visible calculator") [1] is the first spreadsheet computer program for personal computers, [2] originally released for the Apple II by VisiCorp on October 17, 1979. [1] [3] It is considered the killer application for the Apple II, [4] turning the microcomputer from a hobby for computer enthusiasts into a serious business tool, and then prompting IBM to introduce the IBM PC two years ...

5. PlanMaker - Wikipedia

   en.wikipedia.org/wiki/PlanMaker

   PlanMaker is a spreadsheet program that is part of the SoftMaker Office suite. It is available on Microsoft Windows, MacOS, Linux and Android and iOS. PlanMaker is largely similar to Microsoft Excel in function and workflow and uses the same file format .xlsx. The syntax of the formulas is identical, pivot tables are possible. [3]

6. Proprietary software - Wikipedia

   en.wikipedia.org/wiki/Proprietary_software

   Some free software packages are also simultaneously available under proprietary terms. Examples include MySQL, Sendmail and ssh. The original copyright holders for a work of free software, even copyleft free software, can use dual-licensing to allow themselves or others to redistribute proprietary versions. Non-copyleft free software (i.e ...

7. Free and open-source software - Wikipedia

   en.wikipedia.org/wiki/Free_and_open-source_software

   "Free and open-source software" (FOSS) is an umbrella term for software that is simultaneously considered both free software and open-source software. [5] The precise definition of the terms "free software" and "open-source software" applies them to any software distributed under terms that allow users to use, modify, and redistribute said software in any manner they see fit, without requiring ...