Free vertical software for linux

VerticalMeters is a simple system monitor. Two vertical bars. It fits well in the bottom right corner of the screen. Included are both a version with no branding and a version with the BSD Daemon and the new FreeBSD logo in the background.

Obviously inspired by kirambaKUBUNTU, except I wanted one that fit in the right corner, and of course not kubuntu.

Pentago project is a two-player abstract strategy game.

The game is played on a 6x6 board divided into four 3x3 sub-boards. Taking turns, each player places a marble of their color (black or white) onto an unoccupied space on the board, and then rotates one of the sub-boards by 90 degrees either clockwise or counter-clockwise.

A player wins by getting five of their marbles in a vertical, horizontal or diagonal row (either before or after the sub-board rotation in their move). If all 36 spaces on the board are occupied without a row of five being formed then the game is a draw.

The program includes an AI (Artificial Intelligence).

Krystal Drop project is a free clone of NeoGeos Magical Drop.

In it, you play on a field on which lines of gems are being dropped by the top of the screen, at a regular basis or when your opponent makes a combo. You can take or drop gems from the bottom of the screen to make gems disappear.

If you move gems in order to create a vertical alignment of at least three gems of the same colour, they will burst and start a chain reaction with all neighbouring matching gems.

The aim is to prepare some other chain reactions while the first gems are bursting, in order to make a combo and send lines to your opponent. You lose when some gems reach the bottom of the field.

GradeL (Gradebook for Linux) is a gradebook program for teachers. Written in Gambas, this program includes some features I felt were important in a gradebook program. While still buggy and incomplete, it is functional.

GradeL requires the development version of Gambas, currently version 1.9.26. GradeL uses Gambas components gb.eval, gb.qt, gb.qt.ext, gb.qt.kde, and gb.qt.kde.html.

Although my coding technique is at times inefficient, GradeL does meet my needs. It features a spreadsheet-style main screen with vertical column headers that include the assignment name, category, and points. Assignments are grouped in categories for reporting purposes. Teachers may enter numerical scores or alpha-numeric codes for student scores.

These codes may count either zero points or excuse the student from that particular assignment. Gambas Grade provides practical reports designed to give plenty of information while conserving paper. Current reports include complete class report, single marking period progress report, and progress reports for all students. One other feature that I really like is an average row included in the spreadsheet that displays the average for the class on every assignment and for the overall marking period grade.

GradeL project is still in its infancy. The program still has bugs and incomplete features. I am making it available now as a preview for review and testing purposes. You may not want to use it as your primary grading program at this time.

Mancala project is an SDL implementation of the African strategy game.

This is a program which allows you to play it. It uses SDL for graphics, so it should be (relatively) portable and toolkit-agnostic.

Mancala is a very simple, easy-to-learn game. Each player begins with a vertical row of holes or pits filled with a certain number of stones. At either end of the board are the players home pits, which are used to keep score. (In this case, the human player has the left row and the bottom home pit.)

A move is made by typing the number corresponding to the hole you wish to move from. The stones are then picked up and distributed, one to each hole, moving downward until your home pit is reached, and then moving upwards through your opponents row, bypassing his/her home, and moving back downwards in a circle, until all the stones have been distributed.

CAVE WALL (Colored ASCII Visual Editor Without Any Loathsome Limitations) is an ncurses-based ASCII art editor.
CAVE WALL features image import and export in plain ASCII and ANSI formats, simple HTML export, pictures up to 1000x1000 characters large, copying and pasting selections, one-step undo, and 10 different cursor movement modes.
Operations can be performed on rectangular selections such as rotating, colorizing, filling, and horizontal and vertical mirroring with optional "intelligent" character conversion (which changes slashes into backslashes, etc.).
Enhancements:
- This release adds multiple attributes per character support, HTML export using CSS, some minor changes in the user interface, and bugfixes.

FFT Spectra is a tool for the visualization of frequency spectra of an audio signal.

Among other things, it can be used to verify whether you are able to sing and whistle in tune or to tune your guitar.

Examples:

Didgeridoo

Didgeridoo is actually the reason, why i started writing this software. The theory of physics explains that when you blow into a cylindrical tube (such as didgeridoo, but PVC pipe works as well) and vibrate your lips, standing waves develop inside the tube.

At that end of the tube, where the air leaves, there is nearly atmospheric pressure and the standing wave has a node there. At the other end, where one blows the air in, the changes in pressure are maximal and the standing wave must have an antinode here.

The situation is depicted on the picture on the right: The horizontal axis represents a position along the tube and the vertical axis represents a maximal pressure variation from the constant atmospheric pressure. The black vertical line represents a zero variation. The left black point is the mouth-side enpoint of the tube. The pressure variation are maximal here. The black point on the right is the open side od the tube - the pressure is constant here.

This node/antinode restriction permits only standing waves with appropriate wavelength (e.g. frequency) to be developed. Other frequencies are forbidden. So, the red curve is a minimal (fundamental) frequency, which is present in the didgeridoo sound. (Corresponds to 70Hz on the picture bellow).

If we squeezed the red curve twice, i.e. made the frequency twice as high, on both end-points there would be an antinode and the node/antinode constrain would not be fulfilled. Really, we see that the peak at 140Hz bellow almost disappears. If we squeeze the curve a little bit more to obtain the green curve, the boundary condition is again met and the peak at 210Hz is clearly visible bellow. And so on.