GtkPortfolio is a portfolio tracking tool. KStocks KDE based stock graphing tool. MAS Market Analysis System . Supports large variety of complex technical indicators. Has Linux, MSWindows clients.
TREE is a historical price database server.
Feeds itself with live capture of streaming data. Xrapid stock technical analysis. GetQuote is a command-line tool for getting stock quotes. Implemented in C. Datek offers free data streaming. FreeRealTime data streaming.