Note: TGrep2 is very old software at this point and is therefore hard to support at this point but it does exist on AFS. TGrep has also been integrated into NLTK (see here), which is possibly more helpful.
Well-maintained and useful software for phonetic analysis: acoustic measurements, audio playback, creation of visualizations, etc.
There is a Python implementation of much of the Praat functionality, Parselmouth. API documentation is sparse but there is an extremely useful chat/discussion group with help with things that might not be well documented.
Powerful tool and as of Summer 2021 there's a Python module.
Scripts and little helpers
If you find any scripts that are not listed here that you consider useful, please let us know and maybe send a short description of the script along (2-5 lines) — this will help others a lot.
Brett Kessler's Search
From Brett Kessler's webpage: This program searches text corpora for arbitrary regular expressions and produces a report in HTML format. It can read local files, or those available by HTTP or FTP, and it knows how to unpack ZIP files. It requires Perl 5, and the following network modules: Net:: FTP, LWP:: Simple, and LWP:: UserAgent.
Chris Manning's sgrep.prl script
Based on an earlier version by Tom Veatch. Does whole sentence matching of newswire corpus.
Chris Manning's extractbody.prl script
Takes out a particular SGML element (given stand-off annotation), and thus can prefilter LDC newswire.
Jason Brenier's ExtractUnitAcoustics script
On AFS at /afs/ir/data/linguistic-data/Switchboard/swbd-tools/ExtractUnitAcoustics
Extracts acoustic features from Switchboard data. See 00README.TXT file in the directory for instructions.