This is a simple command line to start/stop timers on toggl. I scratched an itch, hope you'll find it useful.
$ toggl -h
usage: toggl start <project>|stop|status|projects|report <since>
<project> - project name
<since> - YYYY-MM-DD (default to start of today)
-version
show version and exit
You'll need a ~/.togglrc with your API key and workspace id. See an example here (timeout is optional).
If you have the Go SDK then
go get github.com/tebeka/toggl
Or you can download a binary from the release section.