Cross-Species Gene Finder (Java)
The first free, cross-platform tool to search for similar genes between two species using the NCBI database. Includes a batch mode.
NOTE: This program can take anywhere from 5 minutes to 1 hour per gene to retrieve results. It is not under my control and depends on the NCBI server load.
ProxyDNS (C - Linux/UNIX/OS X/Cygwin)
Bypass DNS-based internet censorship when port 53, or even DNS packets themselves, are blocked by a firewall.
The download is a prebuilt OS image for the Raspberry Pi 1, 2, 3, and Odroid-W.