GRPN is a RPN calculator for the X Window system built using the GIMP Toolkit (GTK). GRPN works with real numbers, complex numbers, matrices, and complex matrices. Numbers can be displayed in 4 different radix modes, and complex numbers can be displayed in either Cartesian or polar form, in decimal or engineering notation.
RAPID provides stock/commodity charts, buy/sell tax accounting and trade profit graphing, plus dozens of technical analysis tools, including trendlines, point and figure, candlesticks, simple exponential and weighted moving averages, volatility, macd, stochastics, wilder DMI, standard deviation bands, trendlines, time-horizon lines, fibonacci, slope, momentum, OBV, CCI, bollinger bands, probability osc, cycle finder, derivative and integration chart, Williams Accumulation and distribution, etc.
Gnumeric is a powerful and easy to use spreadsheet using GNOME. Its goal is to provide a full featured spreadsheet and a smooth migration path for people and organizations currently using proprietary applications. It provides more sheet functions and greatly improved accuracy when compared to Microsoft's Excel. A plugin system lets you extend Gnumeric, adding functions, I/O formats, and real time data capabilities. The existing Python, Guile, and Perl plugins let you define complex functions. Gnumeric is capable of reading and writing MS Excel (XLS and Office Open XML), and reading Lotus, Applix, Quattro Pro, OpenCalc (ODF), XBase, DIF, SYLK, HTML, Psion, MPS, oleo, sc, misc. text formats, and its native XML. It can also generate Latex, HTML, and others.
CBB is a finance management application. It allows users to keep track of deposits and withdrawals from checking accounts, savings accounts, credit cards, and money markets. It generates reports summarizing the current financial state or graphs the net worth. It is able to import existing Quicken accounts.
Siag Office is a free office package which consists of the spreadsheet Siag, the word processor PW, the animation program Egon, the text editor XedPlus, the file manager Xfiler and the previewer Gvu. Siag is easy to use, yet infinitely flexible through multiple embedded interpreters and a plugin mechanism that allows other programs to run inside the main document. The supported interpreters are SIOD, Guile, Tcl, and Python.