As per the title, we are obviously referring to machines that had cassette audio tape as their default medium even if other media was supported via expansion.
To be clear I mean what was "in the box" aside from the computer, manual, leads etc with regard to this. Not counting any retailer bundled extra bits please! I will give a few examples:
16K/48K ZX Spectrum had the "Horizons" introductory tape included. Later models had a different intro tape.
Oric Atmos had a welcome tape although its name currently escapes me.
BBC Micro and Acorn Electron had a "Welcome" tape included, obviously disk models had a disc instead but we are asking about tapes.
Amstrad CPC464 had a "Welcome to AMSoft" tape included. Other models were disc based.
I am unaware of what other machines had in particular the full CBM machines (seems likely they had something given they had a dedicated cassette unit) as well as say machines such as the Tandy and machines such as the early Atari and Apple.