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2. List of free and open-source software packages - Wikipedia

   en.wikipedia.org/wiki/List_of_free_and_open...

   This is a list of free and open-source software (FOSS) packages, computer software licensed under free software licenses and open-source licenses. Software that fits the Free Software Definition may be more appropriately called free software ; the GNU project in particular objects to their works being referred to as open-source . [ 1 ]

3. Shunting yard algorithm - Wikipedia

   en.wikipedia.org/wiki/Shunting_yard_algorithm

   It can produce either a postfix notation string, also known as reverse Polish notation (RPN), or an abstract syntax tree (AST). [1] The algorithm was invented by Edsger Dijkstra , first published in November 1961, [ 2 ] and named the "shunting yard" algorithm because its operation resembles that of a railroad shunting yard .

4. Postfix (software) - Wikipedia

   en.wikipedia.org/wiki/Postfix_(software)

   Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail. It is released under the IBM Public License 1.0 which is a free software license . Alternatively, starting with version 3.2.5, it is available under the Eclipse Public License 2.0 at the user's option.

5. Notepad++ - Wikipedia

   en.wikipedia.org/wiki/Notepad++

   It supports tabbed editing, which allows working with multiple open files in one window. The program's name comes from the C postfix increment operator. [5] Notepad++ is released as free and open-source software under a GNU General Public License (GPL) 3.0 or later.

6. Reverse Polish notation - Wikipedia

   en.wikipedia.org/wiki/Reverse_Polish_notation

   Video: Keys pressed for calculating eight times six on a HP-32SII (employing RPN) from 1991. Reverse Polish notation (RPN), also known as reverse Łukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators follow their operands, in contrast to prefix or Polish notation (PN), in which operators precede their operands.

7. Increment and decrement operators - Wikipedia

   en.wikipedia.org/wiki/Increment_and_decrement...

   This feature probably suggested such operators to Thompson; the generalization to make them both prefix and postfix was his own. Indeed, the auto-increment cells were not used directly in implementation of the operators, and a stronger motivation for the innovation was probably his observation that the translation of ++x was smaller than that ...