As of November 2019, Industrial Cynos can also be fitted to Ventures, and the Venture has a role bonus which cuts the Industrial Cyno’s Liquid Ozone cost in half.
As of the September 2019 release cynos can only be fitted to Force Recons and Black Ops Battleships. (Prior to this release, cynos could, and commonly were, fitted to any ship with enough CPU and cargo space.) Both Force Recons and Black Ops (except the Marshal) have 50% reduced cycle time for cynos (both normal and Covert), but Force Recons add an 80% fuel cost reduction on top of the reduced cycle time (reducing the duration to 5 minutes and only 50 Liquid Ozone).
For Covert Cyno
Those are Black Ops Battleship, Blockade Runners, Covert Ops Frigates, Force Recon Ships, Stealth Bombers, and Strategic Cruisers (with the covert subsystem); further, the single hulls Etana, Prospect, and Rabisu
Only Black Ops battleships can jump and bridge to covert cynos. Black Ops Battleships can only bridge ships which are able to fit a Covert Ops Cloaking Device (it doesn’t have to be fitted). Bridges by Black Ops only last 20 seconds. For more details about bridging mechanics see the below section about i