I've been running into a recurring problem lately: when I have a lot of work on my plate, and a prospective client comes along, I have a hard time knowing if I have the capacity to take on the new project, and when, and by what deadline I could complete it. Surely this is a common problem among freelancers.
Usually, I just assume that I can do it (better to have too much work than too little), but that's definitely made my life chaotic at times, having too many projects to juggle at once, and having weeks at a time where I had to spend way too much time in front of the computer.
I've looked around for a solution that looks good to me, but I haven't found it yet. So instead, I'm going to solve the problem myself, by making a new tool. Development starts today (design started last week).