Post-its are hard to beat because they function as a backdrop and everyone walks by a couple of times per day, whether they want to or not.
For remote teams that run on Slack, give http://www.slash-done.com/ a try - a good friend of mine had this built after missing a simple way of having everyone check in once their tasks were completed.
For remote teams that run on Slack, give http://www.slash-done.com/ a try - a good friend of mine had this built after missing a simple way of having everyone check in once their tasks were completed.