Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Payable - Easily manage and pay your contractors
Lavagna - OpenSource project management tool designed for small teams.
ContractorPlus - Everything home service contractors need in one app.
productboard - Beautiful and powerful product management.
Bold - Ultra-fast anonymous publishing platform.