Our past post explains how AltBeacon fits into the range of advertising beacons can send and a further post describes the actual data format.
The following beacons support AltBeacon:
https://www.beaconzone.co.uk/FSC-BP101
https://www.beaconzone.co.uk/Feasycom/FSC-BP108
https://www.beaconzone.co.uk/Feasycom/FSC-BP109
The following beacons support custom advertising so can therefore also be set to send AltBeacon advertising:
https://www.beaconzone.co.uk/ibeacon/M52Plus
https://www.beaconzone.co.uk/Meeblue/H1Wristband
https://www.beaconzone.co.uk/Meeblue/m52aplus
https://www.beaconzone.co.uk/Meeblue/M52SAPLUS
https://www.beaconzone.co.uk/Meeblue/M52-SAPlusWaterproof
https://www.beaconzone.co.uk/Meeblue/S1USB
Note however that iBeacon has advantages over AltBeacon as explained in our article.