Here are a few useful tools for linguistic and statistical analyses.
A tutorial to get started in statistical analyses with R (in Portuguese).
Phonological transcriber of Brazilian Portuguese.
Data manipulation in Sociolinguistics made easier.
Link to R's page.
Link to RStudio's page.
Link to ELAN, a free software for annotating video and audio resources.
Link to Audacity, a free software for working with recordings.
Link to Praat, a free software for acoustic analyses.
Link to swirl's page and its multiple R and Statistics tutorials.
Link to Language Variation Suite, an online app for variationist analyses.