Web

There are many backup solutions out there for wordpress sites.

For example these plugins:

UpdraftPlus can be connected with dropbox.

Jetpack

backWPup

Among others.

You might also want to build your own backup routine with cronjobs on the hosting server.

Remember to backup!

Statistics R-project

https://www.rstudio.com/

Apache

https://spark.apache.org/

https://kafka.apache.org/

https://hadoop.apache.org/

2017

2017-07: Top 10 Free Drupal Themes (vardot.com). 

2015

Be inspired by this search on Drupal.org.