BlueWho informs and notifies when a new bluetooth device is discovered. Detection can be requested by the user or automatically continuous until it's stopped. A visible and audible notification can be triggered whenever a new device is detected.

SciDAVis is a free interactive application aimed at data analysis and publication-quality plotting. It combines a shallow learning curve and an intuitive, easy-to-use graphical user interface with powerful features such as scriptability and extensibility.

Zyne is a modular synthesizer which comes with more than 10 builtin modules implementing different kind of synthesis engines and provides a simple API to create your own custom modules.

This is the panel provided by the Xfce4 desktop project. If you want a multi-functional panel that can even handle plugins and the like, xfce4-panel might be worth a try.

Tucnak is a VHF/UHF/SHF logging program for hamradio contests. It supports multi bands, free input, networking, voice and CW keyer, WWL database and much more.

LXTerminal is a VTE-based terminal emulator for the Lightweight X11 Desktop Environment (LXDE).