Report based on data from https://www.ruby-toolbox.com/categories/web_app_frameworks. Rails by far the most popular framework as measured by number of developers who have downloaded or watched the project. It has demonstrated longevity beyond all other frameworks and active development is evident in the number of releases relative to other frameworks.

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Data Summary
projects total_downloads watchers releases released first_release days_active
1 Ruby on Rails 42065029 24138 227 16402 12716 3686
2 Rack 54826059 2079 51 16401 13574 2827
3 Sinatra 17581063 6451 67 16168 13790 2378
4 Padrino 314439 2318 90 16362 14564 1798
5 Cramp 48718 1482 19 16189 14600 1589
6 Cuba 43988 732 33 16301 14724 1577
7 Merb 164948 337 37 14800 13962 838
8 Camping 56846 485 15 15785 13166 2619
9 Hobo 123926 260 94 16268 13632 2636
10 Ramaze 103448 293 41 15682 13551 2131
11 raptor 1298 311 1 15239 15239 0
12 pakyow 7145 312 9 16383 15206 1177
13 Renee 14550 242 13 15403 15262 141
14 Rango 37189 224 28 14885 14398 487
15 Scorched 11134 210 21 16132 15767 365
16 lattice 2384 139 3 15979 15319 660
17 Harbor 1726 24 1 14570 14570 0
18 vanilla 50913 5 48 16241 14342 1899
19 salad 46715 0 122 15909 15527 382
20 Espresso 27252 9 1 15433 15909 0
21 marley 15904 9 16 16227 15287 940
22 Bats 0 11 62 15241 0
23 strelka 20821 7 11 16142 15749 393
24 gin 6650 0 0 0