The objectve of Re-ACT is to establish the foundations for a long-term research effort in integrated active nanophotonic devices based on the use of rare-earth doped double tungstate crystalline materials. Re-ACT puts together several disruptive leading edge technologies in an innovative manner to solve several important problems that are hindering the complete integration of nanophotonic circuits. Research areas that will be investigated include plasmonic propagation with gain, gain assisted all-optical processing, integrated optical isolators and the use of plasmonic resonant effects for novel on-chip sensing devices and nanolasers.It is expected that the results obtained in Re-ACT will lead to several breakthroughs that will enable the realization of long searched fully integrated active nanophotonic devices. The possibility to integrate as much functionality on the chip as desired, with almost unlimited bandwidth and with very low power consumption will open the door to new concepts in telecommunications, computing and personal entertainment that will revolutionize the way human communications will take place. Several breakthroughs in diagnostics, medical imaging and environmental monitoring are also expected. In our ageing society, there is an increasing need for technologies enabling non-invasive medical diagnostics and preventive medicine. Environmental care will benefit from the deployment of distributed networks of very small and sensitive sensors that will help monitoring our fragile resources. Water could become a scarce resource in the future and the importance of having safe water is increasingly becoming a priority. These realizations will be enabled thanks to the development of novel miniaturized microspectrometers and networks of biosensors coupled with arrays of integrated low power consumption nanolasers.