BesoGo

lightweight javascript go board, sgf editor

Free Code on GitHub Editor (realistic theme) Editor (flat theme)

Features

Web-based SGF editor
Usable offline, cross-platform with no installation (just download the source and open testing.html)
Embeddable, responsive, and modular
Editor, viewer, and diagram widgets (see examples below)
Position editing, custom markup, comment, and game info tools
Keyboard and mousewheel navigation
Game tree navigator
Supports both "sibling" and "child" variation markup styles
Multiple board coordinate labeling options (toggle with the 四4 button)
Realistic board and stone textures (CC-licensed assets from other projects)
Customizable CSS-based themes (click here to toggle)
Written in JavaScript, CSS, and HTML5 with no dependencies
Free, open-source software (MIT License)

Embedded Editor

full-width, automatic orientation, all editor panels shown, realistic stones, mousewheel navigation off

Diagram Example

550px max-width, 19x19 board only, western coordinates, flat stones
Toggle CSS Theme

(;AB[cc][cd][ce][dd][di][dk][ee][ej][el][fd][ig][kc][kg][kp][kq][ld][no][nq][oc][od][qc][qd][qq][rp]AW[co][dc][de][df][dj][dl][dq][ec][ed][ei][ek][fc][gn][hq][jg][jj][kd][lc][og][oh][ok][ol][qg][qi][ql]CR[ci][di][ei]SQ[cj][dj][ej]TR[ck][dk][ek]MA[cl][dl][el]LB[cc:8][cd:4][cf:D][co:小][dc:♞][dd:2][de:1][df:7][dq:飞][ec:5][ed:3][ee:6][ef:C][fc:9][fd:⚔][fe:A][gd:B][gn:大][hq:飞][ig:a][jg:b][jj:☯][kg:c][kp:长][kq:一][no:跳][nq:二][oc:双][og:42][qc:101][qq:三][rp:尖])

Vertical Viewer

500px max-width, vertical orientation, game tree and comment/info panels included, flat stones

Game review copyright GoGameGuru, licensed under CC-BY-NC-SA 4.0

Minimal Vertical Viewer

650px max-width, vertical orientation, only navigation controls and player names, eastern coordinates, realistic stones