JbakTaskMan is a free, highly-configureable task manager for Symbian S60 v3 phones, which replaces the old task manager with a new one with lots of features.
It has a quick launch list for your most used applications, memory/RAM info and more…
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PhoneLocator is a GPS phone geo-location software for most of the Nokia S60 mobile phones. You can see where your phone exactly is and track it’s movement through the PhoneLocator website.
The downside is that your operator may charge you, because the phone location information is transmitted through GPRS, however PhoneLocator has an “intelligent update” [...]

StopCall is a free Symbian application, written in the Python language, that allows you to filter out and reject calls from a specified list of numbers. Whenever a caller is placed in the filtering list, you won’t be distracted by that caller anymore, because your phone won’t do a beep and the caller will hear [...]