Global Mapper by Blue Marble is a 64-bit user-friendly GIS application. It has powerful, intuitive interface especially with LiDAR and terrain mapping.
From passive to active remote sensing – photogrammetry to LiDAR, ERDAS Imagine loads you with all the necessary tools for more robust image analysis.
IDRISI TerrSet is primarily for remote sensing and image processing. With over 300 analysis tools, IDRISI TerrSet is as reliable as they come.
There is an abundance of choice for open source remote sensing software. This list of 13 free applications describes what each one brings to the table.