Internet OnOff Free application makes it easy to control your Internet connection. Do it with just one click. We save phone battery.

android Task Manager to close, management applications, optimizing the system, improve system performance!
Press and select the pop-up action menu item!

SmartAss is a shopping assistent application for Android devices. It is free of charge and free of Ads! SmartAss features multiple manageable shopping lists, speach recognition, device synchronization and much more.
SmartAss is very easy to use while working with it is very quick and intuitive. It is designed for every day's use.

Audroid allows you to monitor and manage the status of all the Android volume levels independently.

Also Audroid Pro with all the features enabled is on SlideMe:
http://slideme.org/application/audroid-pro

Trial 3-days;

aiSystemWidget is system monitor utility that provides newest, innovative way of monitoring your Android based mobile device system resources, like Memory, CPU, Network traffic, Battery usage and etc.

Crumbs is a GPS-enabled path-recording application. When enabled, it saves a trail of digital breadcrumbs and displays it in real-time on a map.

Enjoy rising bubbles and a discreet bubbling sound for your relaxation or deep sleep that you can also set as your live wallpaper on devices running android 2.1+ and even interactively rearrange the fishes touching around. Fight stress and relax with this peaceful and untroubled theme.
Now all advertisements mentioned below get waived away after just ten days of use ! :) plus many fixes and improvements.

ConnectBot is a powerful open-source Secure Shell (SSH) client. It can manage simultaneous SSH sessions, create secure tunnels, and copy/paste between other applications.

This client allows you to connect to Secure Shell servers that typically run on UNIX-based servers. See Wikipedia for more information on Secure Shell.

APKoptic is an application manager that enables you to launch or uninstall applications. You can also create a backup of the application on SD card as well as restore or install the APK from SD card.

Manage and maintain your budget with this easy to customize application.

This is the Ultimate Application Killer. This app lets you kill running applications and system services. You can also back-up applications you’ve downloaded or uninstall them from your device.

Features include:
• Kill Running Applications
• Kill Running System Applications
• Hide Applications
• Uninstall Downloaded Applications
• Backup Applications

Ghost Commander is a two panels file manager like Norton|Midnight|Total Commander.

Application installation utility.

Finally, an on-screen keyboard for Android!!!
Enter text without having to slide out the keyboard...

Startup Manager is the most comprehensive and easy-to-use system startup entry monitor and management tool specially designed for Android smartphone. It shows you precisely what applications and processes are configured to run during system startup or login. To safely disable a startup entry from running at system startup, just uncheck its checkbox from the Startup Manager's entry list.

A new way to explore your Android mobile device.
AndroXplorer is an intuitive, user friendly, features rich and sophisticated file manager.
Please kindly be informed that this version is the lite version of AndroXplorer, version 2. It is a free application without ads. This version >DOES NOT< support compression or encryption.

Manage/Transfer your PC Files through your phone

Complete and easy file manager for files and folders, with dual page view for fast transfers. Dual explorer allows you to easily browse the SD card.

TooDo is a free Android application which enables the owner to manage smartly all the things he needs to be done, at the palm of your hand.

There are many applications that automatically start when you turn on your device; many of these you don't use or need, they just consume your valuable resources. Autorun Killer lets you manage applications that start up when you boot your device. Donate version even tries to prevent their restart (and is ad-free).