UPDATE: Adding a 2019; the discovery/runner integration mechanism is same as per 2017 & 2015, so the key things that can go wrong are the
titanium-mobile
.net-4.5
headless-cms
readerwriterlock
content-management
rocketmq
chronicle-bytes
blender-2.67
transactional-database
l2cap
intel-pin
contao
thinktecture-ident-server
createmlui
extentreports
django-south
sql-injection
nsurlsession
gmt
jqvmap
morelikethis
mousepress
azure-iot-hub-device-management
mplab-x
keystore
sap-analytics-cloud
platform-agnostic
angular2-toaster
google-crawlers
qrunnable