Google Spreadsheets R API (googlesheets)
Access and manage Google spreadsheets from R with googlesheets. Features:
• Access a spreadsheet by its title, key or URL.
• Extract data or edit data.
• Create | delete | rename | copy | upload | download spreadsheets and worksheets.

A Swiss-Army Knife for Data I/O (rio)
Streamlined data import and export by making assumptions that the user is probably willing to make: ‘import()’ and ‘export()’ determine the data structure from the file extension, reasonable defaults are used for data import and export (e.g., ‘stringsAsFactors=FALSE’), web-based import is natively supported (including from SSL/HTTPS), compressed files can be read directly without explicit decompression, and fast import packages are used where appropriate.

Markov Chains Transition Matrices (MCTM)
Transition matrices (probabilities or counts) estimation for discrete Markov Chains of order n (1 <= n <= 5).