Below is a sample R packages datathon toolbox for data analysis and modeling.
Visualization: ggplot2, googleVis, rCharts
Presentation: shiny, Rmarkdown
Databases: RODBC, ROracle, RMongo
TextMining: tm, SnowballC, wordcloud
Data Scraping: rvest, httr, twitteR
Web Formats: XML, jsonlite, rJSON