The eight condemned individuals sang praise songs as they were led to their positions, and witnesses across the water also tearfully joined them in singing.
The executed convicts consisted of four Nigerians, two Australians, a Brazilian and an Indonesian. They had been led from their prison to a clearing on a prison island to meet their fate.
The execution of the ninth convict, a woman from the Philippines, was postponed at the last minute.
According to media reports, all the condemned men rejected the blindfolds and raised their voices to sing. One of the songs was the world famous Christian hymn published in 1779 by John Newton, Amazing Grace.
The husband of Pastor Christie Buckingham, who gave spiritual guidance to one of the Australians in his final moments, said his wife told him the men conducted themselves with "dignity and strength until the end".
"She told me the eight of them walked out onto the killing field singing songs of praise," Rob Buckingham told 3AW radio in Australia.
At Cilacap, a town located across the water from the high-security Nusakambangan island, a small band of mourners held a candlelight vigil, and also sang "Amazing Grace".
The song filled out the night sky, while one man cried out and asked the Indonesian president, Joko Widodo, to have mercy. Another supporter read out the names of each inmate one by one.
One man, Owen Pomana, a former convict turned pastor prayed and told the people that the convicts had nothing to fear.
Their family members were seen crying, while friends and supporters were on hand to give them a helping hand as they prepared to bury their loved ones.
Bottom row from left: Nigerians Raheem Agbaje Salami, Silvester Obiekwe Nwolise, Brazilian Rodrigo Gularte and Indonesian Zainal Abidin. Photo by: The Guardian.