QGIS - QGIS is a user friendly Open Source Geographic Information System (GIS) licensed under the GNU General Public License. QGIS is an official project of the Open Source Geospatial Foundation (OSGeo). It runs on Linux, Unix, Mac OSX, Windows and Android and supports numerous vector, raster, and database formats and functionalities.
Coordinates Transformation Online - This on-line tool allows you to insert value pairs of geographic coordinates and transform them to different coordinate system or cartographic projection. You can insert value pairs to the text area labeled as "Input coordinate pairs" - also by using copy/paste even from MS Excell or similar programs. This tool accepts various input formats of value pairs - only what you need is to have one pair by a row. Please see examples in the input text area window.