Varieties of Democracy data download (version 7.1)
Here you will find the most recent country-year and country-date versions of the V-Dem dataset, with or without additional indicators from other sources. The data can be downloaded in SPSS, Stata, Excel, or CSV format.

Varieties of Democracy archive at CurateND
This contains the aggregated (country-year) and disaggregated (country-year-coder) data for v2-v7 of the V-Dem dataset and the posterior estimates for v5-v7.

A Scale of Polyarchy    Excel (including documentation)    SPSS (without documentation)
Data used in Michael Coppedge and Wolfgang Reinicke, “Measuring Polyarchy,” Studies in Comparative International Development 25:1 (Spring 1990): 51-72, updated for all countries in 2000.

Two Dimensions of Democracy    Excel    SPSS    Stata
Data generated as described in Michael Coppedge, Angel Alvarez, and Claudia Maldonado, “Two Persistent Dimensions of Democracy: Contestation and Inclusiveness,” Journal of Politics 70:3 (July 2008): 632-647.

Data on Latin American parties, party systems, and elections    Excel     SPSS    Stata
Data used in Michael Coppedge, “The Dynamic Diversity of Latin American Party Systems,” Party Politics 4:4 (October 1998): 547-68, updated to about 2005.