Baretail ..

A free real-time log file monitoring tool: * Real-time file viewing * Follow tail mode (like tail -f on Unix) * View files of any size (> 2GB) * Scroll to any point in the file instantly * Configurable highlighting * Monitor multiple files simultaneously * Visual indication of file status/changes * International character sets (Unicode and UTF-8) * Many file formats (Win32, Unix, Microsoft IIS logs) * Flexible configuration options and storage * Single, small executable, no installer
Graphviz  ..

Graph visualization is a way of representing structural information as diagrams of abstract graphs and networks. It has important applications in networking, bioinformatics,  software engineering, database and web design, machine learning, and in visual interfaces for other technical domains.
Pentaho  ..

Pentaho Data Integration (PDI, also called Kettle) is the component of Pentaho responsible for the Extract, Transform and Load (ETL) processes. Though ETL tools are most frequently used in data warehouses environments, PDI can also be used for other purposes: Migrating data between applications or databases Exporting data from databases to flat files Loading data massively into databases Data cleansing Integrating applications PDI is easy to use. Every process is created with a graphical tool where you specify what to do without writing code to indicate how to do it; because of this, you could say that PDI is metadata oriented. PDI can be used as a standalone application, or it can be used as part of the larger Pentaho Suite. As an ETL tool, it is the most popular open source tool available. PDI supports a vast array of input and output formats, including text files, data sheets, and commercial and free database engines. Moreover, the transformation capabilities of PDI allow you to manipulate data with very few limitations.