PhoneInfo is a free utility for Symbian S60 that displays several technical information about your phone: IMSI, IMEI, WLAN Id, Phone Id, S60 version, CPU, memory, screen resolution, available fonts, etc...
To keep up to date, I've recently built a new version of eeedroid from git tree to compare with the previous one : eeedroid-0.0.20090209 (which also work on eeepc1000 or 900HD as some users reported). This new build is booting in 24 seconds ... Would that make Android suitable for netbooks ?
Y-Tasks is a collection of development helper tools for S60 3rd edition devices (Symbian OS 9 -->), as the version number shows they are beta versions and hopefully will be extended in the future
Y-Browser is a filebrowser application designed for S60 3rd edition devices (Symbian OS 9.x). Earlier releases include also versions for 1st and 2nd edition, but since 0.80 only 3rd edition devices are supported. This is due some API's that are only supported in 3rd edition.
GTune is a free guitar tuner for your S60 2nd edition mobile.It has very accurate algorithm (less than 0.5 Hz possible mistake), friendly interface (graphical guitar neck), noise level setting and tone generator.
Maemo Process Viewer is a small utilities that lists the running processes on your Nokia 770 tablet, and have the memory used for this application. A graphic can also be drawn, showing the variation of memory's allocation.
There are plenty of utilities to extract the contents of a SIS file from the pre Symbian 9.1 SIS files. However, I could not find that kind of tool for the new SISX file format.
So, I wrote a small python utility that is able to parse the SIS file, print some information about its contents and extract the contained files.