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Thousands of Egyptians are holding a rally in Cairo's Tahrir Square marking the first anniversary of the uprising which toppled President Hosni Mubarak.
Some are celebrating the success of Islamist parties in the first post-Mubarak elections, while others are calling for further political reforms.
The decades-old state of emergency law has been partially lifted to mark the anniversary.
Mr Mubarak is on trial accused of ordering the killing of demonstrators.
He denies the charges.
Hundreds of people who had been sentenced to jail by military courts were due to be released on Wednesday as a concession to the
On Tuesday night, several thousand people had already gathered to camp out in Tahrir Square, the focus of last year's demonstrations - they were joined by thousands more in the morning, representing both the liberal and Islamist ends of the new political spectrum.
The BBC's Jon Leyne, in Cairo, says the mood is peaceful so far, resembling more a huge street party than a political protest.
One year on from Egypt's revolution I am standing in the same square with the same people in a different country. Thousands are filing into Tahrir Square to celebrate the end of a dictatorship which smothered this nation of 85 million people for decades.
But if a year ago the people were united in one cause the scene in the square today also reveals their divisions. Before there was only one stage, one microphone and one message. Now there are many.
And as in the new parliament the loudest voice, the biggest platform, the greatest support in the square today belongs to the Muslim Brotherhood.
At the moment Tahrir Square feels more like a victory party for them than a celebration for all the people. The Facebook generation are simply lost in the crowd. Political Islam has taken centre stage both in Tahrir and in the Arab world. It now believes it can now reshape the region in its image.
The various groups are all competing to claim ownership of the revolution, says our correspondent, from the youth movement which began the protests a year ago to the Muslim Brotherhood, which now dominates parliament, and the Supreme Council of the Armed Forces (Scaf), which took power last February after Mr Mubarak stepped down.
Protesters who stayed in the square overnight put up tents and chanted slogans against the military council, which many say should stand down immediately.
"We are not here to celebrate. We are here to bring down military rule," pharmacist Iman Fahmy told the Associated Press news agency.
"They have failed the revolution and met none of its goals."
Demonstrator Khaled Abdallah told the Reuters news agency: "The army and police murdered us and cut off the revolution's voice; but I am telling you now, the revolution's voice will not be silenced."
Other groups chanted "Down with military rule" and "Revolution until victory, revolution in all of Egypt's streets".
But some people in the square said the protests should end and the new leaders be given time to move Egypt forward.
"The council will leave power in any case. Sure, the revolution is incomplete, but it doesn't mean we should obstruct life," accountant Mohamed Othman told Reuters.
Teacher Alaa Mohammed, a supporter of the Muslim Brotherhood, said the military council had overseen the "cleanest elections ever" and protected the revolution.
Others said they had turned out to remember the more than 850 people killed during the Tahrir Square protests.
"We should not forget that there was bloodshed here. This is not a celebration, but it is a big event to send our condolences to our brothers who passed away between the 25th of last January and now," said Walid Saad.
Some are celebrating the success of Islamist parties in the first post-Mubarak elections, while others are calling for further political reforms.
The decades-old state of emergency law has been partially lifted to mark the anniversary.
Mr Mubarak is on trial accused of ordering the killing of demonstrators.
He denies the charges.
Hundreds of people who had been sentenced to jail by military courts were due to be released on Wednesday as a concession to the
On Tuesday night, several thousand people had already gathered to camp out in Tahrir Square, the focus of last year's demonstrations - they were joined by thousands more in the morning, representing both the liberal and Islamist ends of the new political spectrum.
The BBC's Jon Leyne, in Cairo, says the mood is peaceful so far, resembling more a huge street party than a political protest.
One year on from Egypt's revolution I am standing in the same square with the same people in a different country. Thousands are filing into Tahrir Square to celebrate the end of a dictatorship which smothered this nation of 85 million people for decades.
But if a year ago the people were united in one cause the scene in the square today also reveals their divisions. Before there was only one stage, one microphone and one message. Now there are many.
And as in the new parliament the loudest voice, the biggest platform, the greatest support in the square today belongs to the Muslim Brotherhood.
At the moment Tahrir Square feels more like a victory party for them than a celebration for all the people. The Facebook generation are simply lost in the crowd. Political Islam has taken centre stage both in Tahrir and in the Arab world. It now believes it can now reshape the region in its image.
The various groups are all competing to claim ownership of the revolution, says our correspondent, from the youth movement which began the protests a year ago to the Muslim Brotherhood, which now dominates parliament, and the Supreme Council of the Armed Forces (Scaf), which took power last February after Mr Mubarak stepped down.
Protesters who stayed in the square overnight put up tents and chanted slogans against the military council, which many say should stand down immediately.
"We are not here to celebrate. We are here to bring down military rule," pharmacist Iman Fahmy told the Associated Press news agency.
"They have failed the revolution and met none of its goals."
Demonstrator Khaled Abdallah told the Reuters news agency: "The army and police murdered us and cut off the revolution's voice; but I am telling you now, the revolution's voice will not be silenced."
Other groups chanted "Down with military rule" and "Revolution until victory, revolution in all of Egypt's streets".
But some people in the square said the protests should end and the new leaders be given time to move Egypt forward.
"The council will leave power in any case. Sure, the revolution is incomplete, but it doesn't mean we should obstruct life," accountant Mohamed Othman told Reuters.
Teacher Alaa Mohammed, a supporter of the Muslim Brotherhood, said the military council had overseen the "cleanest elections ever" and protected the revolution.
Others said they had turned out to remember the more than 850 people killed during the Tahrir Square protests.
"We should not forget that there was bloodshed here. This is not a celebration, but it is a big event to send our condolences to our brothers who passed away between the 25th of last January and now," said Walid Saad.
