Others

Goose vs Velociraptors
https://devpost.com/software/goose-v-velociraptors
https://github.com/bahorn/AstonHack2017

Binary Star assorted files
some games, some utilities, some demos, some hacks (trackball)
www.binarystarsoftware.com/download

High score versions of:
MineStorm II, Fortress of Narzod, Sloar Quest, Star Castle (These 4 also as limited editions)
Cosmic Chasm, StarShip, Web Wars, Scramble
Were made by Binary Star Software (available via ebay).

YMusic
Available as download, was also released as cartridge (ebay)

Spin -Cart I + II
Conversion of Vectrex games to use a spinner as input. Released on ebay, and can be bought from Binary Star shop.

Vectrex Fans Unite!
On Facebook, the (closed) group Vectrex Fans Unite! has a files section, which also contains a couple of files which are no where else available (spinner hacks, sample demos, music etc)

Manu’s
On Manu’s page there are quite a few demos, source code snippets and games. The original site is offline now – but the wayback machine also has all download, so: http://pelikonepeijoonit.net/vec/coders.html