Netttool 112.3 Windows x86 (http://simutrans-germany.com/files/upload/nettool-112-3.zip)
Linux version includes nographics version, nettool, and makeobj. For non-debian-based system, you can extract the deb packages manually.
(112.3)
Linux x86 (http://ppa.launchpad.net/arieseptian/simutrans/ubuntu/pool/main/s/simutrans/simutrans-nographics_112.3-1ppa3_i386.deb)
Linux x86_64 (http://ppa.launchpad.net/arieseptian/simutrans/ubuntu/pool/main/s/simutrans/simutrans-nographics_112.3-1ppa3_amd64.deb)