Qtstalker - Commodity and stock market charting and technical analysis

Qtstalker - Commodity and stock market charting and technical analysis - a user friendly Technical Analysis package for GNU/Linux. Similar to commercial wares such as Metastock, Supercharts and Tradestation. Keeps to a lean, simple design for speed, portability, and low resource usage. Because it uses a plugin model, Qtstalker can easily be extended. It is 100% free software, distributed under the terms of the GNU GPL. An active development community is continually adding new features.
Features from http://qtstalker.sourceforge.net/intro.html:
A point-and-click object-oriented graphical user interface.
Chart plugins include line, bar, candlestick, point and figure, and swing.
Customizable colors. Logarithmic and linear arithmetic scaling. Scale to screen.
Indicators plugins include MACD, MAs, Bollinger Bands, RSI, and dozens more.
Chart drawing objects: trendlines, buy/sell arrows, horizontal and vertical lines, fibonacci retracement lines, text.
Quote plugins download data from online sources such as Yahoo, CME, NYBOT.
Data import plugins for plain-text CSV files and MySQL database.
The "Plugin" architecture for quotes and indicators enables easy future extensibility.
Daily, weekly and monthly chart compression (intra-day in development)
Various data classes to support for investment types such as stocks, futures, indices, ratios and spreads.
A back testing function allowing indicator performance tests using actual trading data.
A very basic portfolio manager. Good for tracking open positions. (Suggestions welcome.)
A Scanner that can scan the qtstalker database for charts that meet a user defined criteria.

Sounds good. Try Qtstalker for GNU/Linux.