Full text indexing and search in go. Index any data object in your software: Text strings, numbers, dates, JSON. Extensible. Aims to have smart defaults. Multiple query types supported, even multiple natural languages. Aims to be easy to use: Three lines of code to index, another three lines to search.
Possibly the best collection of audiovisual CODECs for Win32 and Win64 out there. Widely reputed to have no malware or spyware hidden anywhere within.