Rather than downloading files from here, you are strongly advised to type the command
net from http://personalpages.manchester.ac.uk/staff/mark.lunt
into stata and download from there. This ensures that the correct files are downloaded to the correct places.
gmatch.ado program to perform "full" best-first greedy matching
fgmatch.ado program to perform "fast" best-first greedy matching
rmatch.ado program to perform matching with replacement
propwt.ado program to calculate various types of propensity-based weights
proptrim.ado program to trim subjects based on their propensity scores
pbalchk.ado program to check covariate balance after matching, weighting or stratifying