QGIS, formerly Quantum GIS, is a user friendly open source Geographic Information System (GIS) licensed under the GNU General Public License that runs on Linux, Unix, Mac OSX, and Windows and supports numerous vector, raster, and database formats and functionalities.
QGIS vs ArcGIS opinions
powerfull, stable, userfriendly, beautiful rendering and free.
u can do everything in qgis what u can do in ArcGIS but also in QGIS u have full acces to the source code and all is free
The GUI is pretty simple and intuitive and it runs decent on windows (at least as fast as ArcMap), but on GNU/Linux it flies. And since the license is GPL you can use it for different purposes (from educational to research or commercial) without worrying for a sue.
QGIS runs on multiple platforms, has a strong community and is becoming more and more mature. You can do almost everything using QGIS and it integrates very well with GRASS and SAGA for additional power.
yes. because for linux this is the only option available.
Closest in terms of UI, and gets a lot of extra power from integration with other packages like Grass and orfeo.
Free with same functionality.
R is a free software environment for statistical computing and graphics. It is a GNU project which is similar to the S language and environment which was developed at Bell Laboratories (formerly AT&T, now Lucent Technologies) by John Chambers and colleagues. R can be consider.
R (programming language) vs ArcGIS opinions
Even though this programming language is not specific to spatial data, the vast collection of R packages available for importing, processing, analysing, converting and visualising spatial makes it an excellent alternative that can create fully reproducible processes. Searching "R Spatial" online will bring up a wealth of books, tutorials and resources.
GRASS GIS (Geographic Resources Analysis Support System) is an open source, free software (FOSS) Geographical Information System (GIS) with raster, topological, vector, image processing, and visualization functionality.This app doesn't have any features at the moment.
GRASS GIS vs ArcGIS opinions
PostGIS adds support for geographic objects to the PostgreSQL object-relational database. In effect, PostGIS "spatially enables" the PostgreSQL server, allowing it to be used as a backend spatial database for geographic information systems (GIS), much like ESRIs SDE...This app doesn't have any features at the moment.
PostGIS vs ArcGIS opinions
While PostGIS can collect GIS data, its primary functionality is that of a database and doesn't provide most of the feature set that ArcGIS has.
SAGA - System for Automated Geoscientific Analyses - is a Geographic Information System (GIS) software with immense capabilities for geodata processing and analysis. SAGA is programmed in the object oriented C++ language and supports the implementation of new functions with a...
MapServer is an Open Source platform for publishing spatial data and interactive mapping applications to the web. Originally developed in the mid-1990’s at the University of Minnesota, MapServer is released under an MIT-style license, and runs on all major platforms (Windows...This app doesn't have any features at the moment.
MapWindow is a fully free and open source geographic information system project. It includes an open source programming component, MapWinGIS ActiveX, and an extensible desktop application that supports plug-ins written in .NET (C# and VB.NET).This app doesn't have any features at the moment.
uDig is a GIS software program produced by a community led by Canadian-based consulting company Refractions Research. It is based on the Eclipse platform and features full layered open source GIS. It is written in Java and released under GNU Lesser General Public License.This app doesn't have any features at the moment.