Whatever your area of interest (engineering, finance, medical, units conversion…), you can now design your own specialized calculator.
My Calcul S60 is a highly versatile calculator application for Nokia Smartphones with two key features :

its 48 function buttons can be customized to do exactly the calculations you want,
it can store an unlimited number of equations in the form of [...]

Do all possible finance and business calculations on your Smartphone : loans, discounted cash flows, IRR, currency conversion, bonds, annuities, compounded interests and growth, margins, optional RPN, … all in one single calculator.

Version 3.03 of Finanz S60 was just released. It makes better use of the screen space on touch screen phones. Upgrade is free for registered users [...]

Projekt S60 is a highly versatile application for the management of lists on Nokia Smartphones, with a large number of uses :

Outliner
To-do lists
Notes taking
Project management
Mind mapping
Shopping lists
Packing lists
…

Many users implement David Allen’s popular Getting Things Done system (GTD) with Projekt S60 on their Smartphone.

Version 1.24 of Projekt S60 [...]

Version 3.02 of Finanz S60 was just released. Changes from the previous version 3.01 :

this version also runs on S60 5th edition phones (touch screen), like e.g. the Nokia 5800 XpressMusic and the Nokia N97.
the operation in RPN mode has been fine tuned, making it closer to the operation of the classical HP12c.

Upgrade is free [...]

Version 1.23 of Projekt S60 was just released. Changes from the previous version 1.22 :

the problem with the Import command on some phone models (see comments) is fixed
the UI for S60 5th Edition phones (touch screen) has been slightly improved

Upgrade is free for registered users of previous versions of Projekt S60. However if you upgrade (including [...]

Two users report problems with Projekt S60 and Finanz S60 on this phone :
” I am trying to install the Project for S60v3 on my Nokia 6124 but when I start the program the phone enters an endless reboot loop. I have to remove the memory card… “
” [Finanz S60] Installation OK. But, [...]

As there is no PC companion application to Projekt, a number of users have tried existing PC outliner applications. This is from the Google cache of an entry from the now defunct Kylom forum :
Hi everybody,
I’m still using my nokia 9300 and Projekt almost on a daily basis at my office. For YEARS now I have [...]

This is the most common problem users have encountered in all versions of Finanz (UIQ, UIQ3, S60…) : when importing exchange rates, the application seems to hang or stop with an error message.
In all cases so far the problem has been solved this way : change the setting at the line Check proxy server, in General settings [...]

Version 1.22 of Projekt S60 was just released. Apart from a few other improvements, the infamous import from text bug is fixed. Projekt 60 is now also translated to Czech and Japanese and has been adapted to run on S60 5th Edition phones like the Nokia 5800 XpressMusic. Upgrade is free for registered [...]