If you're looking for more lightweight forwarder for edge devices / servers / containers, use Fluent Bit, an open source data collector specifically designed for data forwarding. Fluent Bit is more efficient in terms of CPU / Memory usage, but has limited features. The following table list the available Linux packages for different distributions. Note that Fluent Bit packaged is known as td-agent-bit.
Fluentd v0.12 is available on Linux and Mac OSX. Also, Treasure Data packages it as Treasure Agent (td-agent) for RedHat/CentOS and Ubuntu/Debian and provides a binary for OSX. td-agent 2.5 uses ruby 2.5 and td-agent 2.3 uses ruby 2.1