Cosmo is a "safe templates" engine. It allows you to fill nested templates, providing many of the advantages of Turing-complete template engines, without without the downside of allowing arbitrary code in the templates. The current version of Cosmo is 16.06.04. This release adds support for Lua 5.3. The previous version, 14.03.04, fixed a bug uncovered by a new version of LPEG. Version 13.01.30 added support for Lua 5.2. Version 10.04.06 added expressions to selectors $(\<exp\>), allowed nested \[\[ \]\] in templates, made commas between subtemplates optional, and added a second parameter to cosmo.yield that tells Cosmo the first parameter is a literal to be included in the expansion instead of an environment. Cosmo is installed as a rock. To install the most recent release do `luarocks install cosmo`. The Cosmo rock is in the standard repository. Installation on UNIX-based systems need the gcc toolchain.