If you don't want to step up to a full monitoring solution such as Nagios you can create your own scripts for monitoring the things that you want to monitor, such as disk space.
In past Live Online chats and blog posts, I've mentioned any easy way to temporarily convert a Windows PC into a Linux-based computer in order to ensure that your online banking credentials positively can't be swiped by password-stealing malicious software.
Often times, we are faced with issues pertaining to DNS name resolutions. In this series of articles, I will explore different tools available in Linux that can help in DNS name resolutions.
FFmpeg is a complete, cross-platform solution to record, convert and stream audio and video. It is a very fast video and audio converter and includes libavcodec which is the leading audio/video codec library. It can also grab from a live audio/video source.