GBonds is a savings bond inventory program for GNOME. It allows you to track the current redemption value and performance of your U.S. Savings Bonds and keep a valuable record of the bonds you own. Gbonds is similar in functionality to "Savings Bond Wizard" for Windows distributed by the U.S. Treasury.
getstockquote is a Perl script which fetches stock and mutual fund data for one or more ticker symbols and returns an HTML table on STDOUT with each stock's data, including last trade price, day high, day low, change, last trade date/time, volume, open, close, bid, and ask. It can look up information from NYSE, NYSE Europe, Fidelity, T. Rowe Price, Vanguard, ASX (Australian Stock Exchange), and TIAA-CREF Annuities. It is completely configurable via command line arguments, and can be easily used by more than one page/script/etc. with no modification.
GnuCash allows you to track bank accounts, stocks, income, and expenses. As quick and intuitive to use as a checkbook register, it is based on professional accounting principles to ensure balanced books and accurate reports. It is backed by an active development community and is blossoming into a full-fledged accounting system.
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.