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EvoFETCH is a tool to extract information about software entities such as classes, methods, and attributes from software repositories.
EvoFETCH is middleware and makes use of other freely available software to perform the extraction and provide query functionality.
qpkg is Arch Linux' "query package" tool, using it, you can search for packages in all known repositories and in AUR, install packages directly from AUR, find packages owning files on your filesystem, check the integrity of installed packages, a.m.m.
Geotran is a tool meant to help geocachers who are traveling to a foreign country, but do not speak the language. Geotran, is a python tool that invokes Google Translator to translate the pocket queries.
Picxml is a tool for xml files management. Used as command: Picxml is a shell friendly, xpath like querytool. Used as library: picxml, is a full featured xml Parser, wich allows you to navigate, find/create/update/delete/print nodes.
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Epicxml is an xql like command line interpretor for xml files management. Used as command: Epicxml is a shell friendly, xpath like querytool, wich allows you to navigate, find/create/update/delete/print nodes. It is based on picxml.
SubtitleGet is a command-line tool written in Python, that I am creating in my spare time. It's main purpose is to search, download and/or upload subtitles using Opensubtitles.org fantastic site.
Metmask has moved to github http://github.com/hredestig/metmask
Metmask is a tool written in python for managing chemical identifiers for metabolomics experiments. It can incorporate identifiers from local textfiles, several online databases, query PubChem and record all found associations in a local sqlite database.
...Using generator syntax for writing queries allows the user to formulate very eloquent queries. It increases the level of abstraction and allows a programmer to concentrate on the business logic of the application.
Following is an example of a query in Pony:
select(p for p in Product if p.name.startswith('A') and p.cost <= 1000)
Pony translates queries to SQL using a specific database dialect. Currently Pony works with SQLite, MySQL, PostgreSQL and Oracle databases.
Pony ORM also include the ER Diagram Editor which is a great tool for prototyping. You can create your ER diagram online at https://editor.ponyorm.com, generate the database schema based on the diagram and start working with the database using declarative queries in seconds.
DNAID software is a tool for assessing confidence in biological identifications made by comparing DNA sequences. It allows DNA sequences to be placed within a taxonomy and determines confidence in matches of a query sequence to each taxon.
a tool-kit for creating "web 2.5 generation", include several useful stuff to work with semantic web (otology editor, gui for sparql query, ontology components...) and design RIAs's gui visually (html + ajax based apps, flash based apps,...)