| File Type 1 | Lotus 1-2-3 Spreadsheet | ||||||
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| File Format | Proprietary (IBM) | ||||||
| Usage | Open manually | ||||||
| Rank | ★ ★ ☆ Average | ||||||
| Description |
Spreadsheet created by Lotus 1-2-3, part of IBM Lotus SmartSuite; organizes data in rows and columns; functions can be applied to the data in various cells, which can automatically populate the data in other cells. Lotus 1-2-3 was first developed by Lotus Development Corporation, which was bought by IBM in 1995. The "1-2-3" refers to the program's three main capabilities: 1) spreadsheet functions, 2) creating charts and graphs, and 3) basic database operations. |
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| Updated | September 9, 2010 |
| File Type 2 | PCB123 Circuit Board Design | ||
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| File Format | Proprietary (Sunstone Circuits) | ||
| Usage | Open manually | ||
| Rank | ★ ★ ☆ Average | ||
| Description |
Printed circuit board designs created with PCB123 are saved with a ".123" extension. They each contain the layout of a circuit board and may include several types of electrical components.
PCB123 is a free printed circuit board (PCB) design program developed by Sunstone Circuits. It is used for creating 2-6 layer circuit board designs and prototypes. The program includes a CAD interface for creating and editing PCB layouts and schematics. Completed designs can be submitted to Sunstone Circuits for manufacturing. |
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| Updated | November 9, 2009 |
About Sunstone Circuits PCB123