1. Data Mining Tools
some examples

2. Data Mining Tools Free software Free software (paid services)
Weka R
Python
Cortana
Free software (paid services)
KNIME
RapidMiner
Commercial software
SAS Enterprise Miner
SPSS Modeler (IBM)

3. R Programming Language
Command-line interface oriented
Very extensive language
statistical analysis
data manipulation
data mining
Several graphical user interfaces
RStudio
Interactive analysis over the web
Shiny (by RStudio)

4. KNIME Konstanz Information Miner Academic  Commercial
Large, many plug-ins (Weka algorithms, Cortana)

5. RapidMiner Rapid-I Academic  Commercial
Large, many plug-ins (Weka algorithms)

6. RapidMiner
Fancy visualisations

7. Popularity
source: kdnuggets.com

8. Commercial vs. free tools
source: kdnuggets.com