Markdown is a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML).
OpenRefine (formerly Google Refine) is a tool for cleaning messy data (e.g. fixing inconsistencies), transforming it between different formats, and exploring data.
epub-tools is a collection of Python tools for generating and managing epub documents from Word, RTF, DocBook, TEI and FictionBook.
All Our Ideas is a research project that seeks to develop a new form of social data collection by combining the best features of quantitative and qualitative methods. Using the power of the web, we are creating a data collection tool that has the scale, speed, and quantification of a survey while still allowing for new information to "bubble up" from respondents as happens in interviews, participant observation, and focus groups.
Modest Maps is a display and interaction library for tile-based maps in Flash and Python that can display maps from external sources (e.g. OpenStreetMap, NASA Blue Marble, Yahoo!, Microsoft, but not Google Maps
A software tool for the manipulation of audio recordings. Wavesurfer provides basic audio editing function, such as excision, copying, pasting, zero-crossing adjustment, and effects such as fading, normalization, echo, inversion, reversal, replacement with silence, and DC-removal.
"ActionScript library for creating visualizations that run in the Adobe Flash Player"
Pattern is a Python web mining module with tools for data retrieval (Google + Twitter + Wikipedia API, web spider, HTML DOM parser), text analysis (rule-based shallow parser, WordNet interface, syntactical + semantical n-gram search algorithm, tf-idf + cosine similarity + LSA metrics) and data visualization (graph networks).
VIVO is an open source semantic web application originally developed and implemented at Cornell. When installed and populated with researcher interests, activities, and accomplishments, it enables the discovery of research and scholarship across disciplines at that institution and beyond. VIVO supports browsing and a search function which returns faceted results for rapid retrieval of desired information.
TiddlyWiki is a reusable personal web notebook. It allows anyone to create personal hypertext documents that can be published on the Web, and also search and tag content.
Using Google Spreadsheets as the backend database is awesome because it is easy to use, share and collaborate with." -- website
Bokeh is a Python interactive visualization library for large datasets that natively uses the latest web technologies. Its goal is to provide elegant, concise construction of novel graphics in the style of Protovis/D3, while delivering high-performance interactivity over large data to thin clients.