Metakit is a small, portable database library using a hybrid relational / hierarchical data model with a column-wise internal storage format. For C++, include a single header file and 125 kb DLL or statically link directly. Ideal for desktops, embedded systems, smartphones, and PDAs. Bindings for Python and Tcl. A very mature, stable code base.
HTMTEX reads hand-coded ASCII HTML documents with embedded TEX-like islands (backslash-escaped symbols, inline math, and displayed math). It writes Unicode HTML documents with UTF-8 encoded symbols, and span- and table-formatted math. The converter itself is a customizable sed script. Visualization is regulated by a customizable stylesheet file.
Ridual is a dual-pane file manager for GNOME. It features tight integration with GNOME (providing GVFS mount support, bookmarks and user directories, a removable drives list, file icons, and application associations), keyboard-oriented control (with adjustable shortcuts for everything, single-window dialogs, and messages), and advanced tasks and queues management.
Skyperious is a Skype database viewer and merger. It can open local Skype SQLite databases and look at their contents, search across all messages and contacts, browse, filter, and export chat histories, see chat statistics, import contacts from a CSV file to your Skype contacts, view any database table and export its data, change, add, or delete data in any table, and execute direct SQL queries. It can also compare two Skype databases, show the differences in chats and contacts, and copy any spotted differences from one database to another. Skype uses local database files to keep its chat history, and older messages tend to get lost as computers get upgraded or changed.
deawk is a very simple double-entry bookkeeping system designed for self-employed people. It uses three (text) data files: transactions, a chart of accounts, and an optional vehicle log. Reports are generated by running bash scripts which run awk. deawk currently does not support depreciation of capital assets.
Inbucket is an email testing service. It accepts messages for any email address and makes them available to view via a Web interface. It allows Web developers, software engineers, and system administrators to quickly see the emailed output of their applications. No per-account setup is required. Mailboxes are created on the fly as mail is received for them, and no password is required to browse the content of the mailboxes.
PumpKIN is a fully functional TFTP server and TFTP client that implements the TFTP protocol according to RFC1350. It also implements the block size option, which allows the transfer of files larger than 32MB, as well as transfer size and transfer timeout options described in RFC2348 and RFC2349.